[Script Info] Title: [Events] Format: Layer, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text Dialogue: 0,0:00:32.44,0:00:34.27,Default,,0000,0000,0000,,Wow! It's so great to be here! Dialogue: 0,0:00:34.27,0:00:36.72,Default,,0000,0000,0000,,I'm so happy to see you guys. Dialogue: 0,0:00:36.72,0:00:40.64,Default,,0000,0000,0000,,Arguably, one of the most disruptive \Nevents in the history of the planet Dialogue: 0,0:00:40.64,0:00:42.85,Default,,0000,0000,0000,,has got to be the rise\Nof the animal kingdom. Dialogue: 0,0:00:42.85,0:00:44.18,Default,,0000,0000,0000,,Definitely. Dialogue: 0,0:00:44.18,0:00:47.22,Default,,0000,0000,0000,,I mean, here is Earth, simmering along, \Nminding its own, single-cell business Dialogue: 0,0:00:47.22,0:00:50.56,Default,,0000,0000,0000,,for nearly four billion years,\Nand some group of restless cells Dialogue: 0,0:00:50.56,0:00:54.19,Default,,0000,0000,0000,,comes together and decides \Nto become multi-cellular metazoa and well... Dialogue: 0,0:00:54.19,0:00:57.33,Default,,0000,0000,0000,,the neighborhood's \Nnever been the same since, has it? Dialogue: 0,0:00:57.33,0:01:00.33,Default,,0000,0000,0000,,And we have a remarkable \Ndiversity of animals Dialogue: 0,0:01:00.33,0:01:02.64,Default,,0000,0000,0000,,with whom we share the planet, don't we? Dialogue: 0,0:01:02.64,0:01:05.97,Default,,0000,0000,0000,,Millions of species swimming, \Nscurrying, slipping around, Dialogue: 0,0:01:05.97,0:01:08.77,Default,,0000,0000,0000,,seemingly endless forms,\Nmost beautiful. Dialogue: 0,0:01:08.77,0:01:10.80,Default,,0000,0000,0000,,How do you make sense of it all? Dialogue: 0,0:01:10.80,0:01:15.24,Default,,0000,0000,0000,,Well, it may just help to know \Nthat 99% of all animal life Dialogue: 0,0:01:15.24,0:01:18.30,Default,,0000,0000,0000,,fall into just eight major groups. Dialogue: 0,0:01:18.30,0:01:20.97,Default,,0000,0000,0000,,Eight body plans. Dialogue: 0,0:01:20.97,0:01:23.12,Default,,0000,0000,0000,,Scientists call these "phyla". Dialogue: 0,0:01:23.12,0:01:27.36,Default,,0000,0000,0000,,And if you know these eight plans,\Nyou've got an incredible grasp Dialogue: 0,0:01:27.36,0:01:31.38,Default,,0000,0000,0000,,of the constraints and freedoms \Nof the animal world. Dialogue: 0,0:01:31.38,0:01:33.83,Default,,0000,0000,0000,,And there's something special\Nabout these eight phyla. Dialogue: 0,0:01:33.83,0:01:38.21,Default,,0000,0000,0000,,While species go extinct every day,\Nthese phyla have prevailed and persisted Dialogue: 0,0:01:38.21,0:01:41.50,Default,,0000,0000,0000,,for over 550 million years. Dialogue: 0,0:01:41.50,0:01:44.17,Default,,0000,0000,0000,,Every mass extinction \Nthe planet has mustered, Dialogue: 0,0:01:44.17,0:01:46.16,Default,,0000,0000,0000,,they've managed to make it through. Dialogue: 0,0:01:46.16,0:01:48.40,Default,,0000,0000,0000,,So who are these amazing methuselahs? Dialogue: 0,0:01:48.40,0:01:51.32,Default,,0000,0000,0000,,Let's look at plan 1: the sponges. Dialogue: 0,0:01:51.32,0:01:54.02,Default,,0000,0000,0000,,These are Earth's first \Ntrue blue animals. Dialogue: 0,0:01:54.02,0:01:57.21,Default,,0000,0000,0000,,They scripted that vital language\Nfor single cells to work together Dialogue: 0,0:01:57.21,0:02:00.93,Default,,0000,0000,0000,,with other cells for a common cause,\Nin this case, pumping. Dialogue: 0,0:02:00.93,0:02:03.13,Default,,0000,0000,0000,,So hail Mother Sponge! Dialogue: 0,0:02:03.13,0:02:05.46,Default,,0000,0000,0000,,It sucks, it pumps, \Nit's a mother of us all. Dialogue: 0,0:02:05.46,0:02:08.88,Default,,0000,0000,0000,,And you know, some of us have a problem\Nbeing descendants from apes. Well... Dialogue: 0,0:02:08.88,0:02:13.29,Default,,0000,0000,0000,,So, plan number 2: the cnidarians:\Nanemones, jellies and corals. Dialogue: 0,0:02:13.29,0:02:17.71,Default,,0000,0000,0000,,These were the first guys to put muscle \Nand nerve together into a body plan, Dialogue: 0,0:02:17.71,0:02:20.24,Default,,0000,0000,0000,,and with that, we get animal behavior. Dialogue: 0,0:02:20.24,0:02:23.63,Default,,0000,0000,0000,,They're characterized by a round body, \Nradially symmetric, Dialogue: 0,0:02:23.63,0:02:25.98,Default,,0000,0000,0000,,and little stinging cells called "cnidae". Dialogue: 0,0:02:25.98,0:02:27.96,Default,,0000,0000,0000,,If any of you have been \Nstung by a jellyfish, Dialogue: 0,0:02:27.96,0:02:29.93,Default,,0000,0000,0000,,you know what I mean, \Nthey pack a punch. Dialogue: 0,0:02:29.93,0:02:32.86,Default,,0000,0000,0000,,So these were the first guys\Nto coin animal behavior. Dialogue: 0,0:02:32.86,0:02:36.93,Default,,0000,0000,0000,,Okay, our next body plan –\Nlook at those little anemones – Dialogue: 0,0:02:36.93,0:02:39.96,Default,,0000,0000,0000,,– are the platyhelminthes.\NVery contemptuous phylum, Dialogue: 0,0:02:39.96,0:02:42.17,Default,,0000,0000,0000,,many biologists don't feel \Nit's a true phylum, Dialogue: 0,0:02:42.17,0:02:44.44,Default,,0000,0000,0000,,but comprised of many different phyla, Dialogue: 0,0:02:44.44,0:02:50.18,Default,,0000,0000,0000,,and so right now the animal tree\Nis being shaken right at its roots. Dialogue: 0,0:02:50.18,0:02:54.91,Default,,0000,0000,0000,,But what you need to take home\Nfrom this representative body plan is that, Dialogue: 0,0:02:54.91,0:02:58.71,Default,,0000,0000,0000,,here we see the first representation \Nof a left-right symmetry. Dialogue: 0,0:02:58.71,0:03:01.88,Default,,0000,0000,0000,,Bilateral symmetry, \Nwhich all complex animals have. Dialogue: 0,0:03:01.88,0:03:05.78,Default,,0000,0000,0000,,And a concentration of sense organs \Nright at one part of the body. Dialogue: 0,0:03:05.78,0:03:07.48,Default,,0000,0000,0000,,The makings of a head, Dialogue: 0,0:03:07.48,0:03:09.65,Default,,0000,0000,0000,,and with a head you can have \Ndirected animal behavior, Dialogue: 0,0:03:09.65,0:03:11.52,Default,,0000,0000,0000,,and hunting. Dialogue: 0,0:03:11.52,0:03:14.32,Default,,0000,0000,0000,,This is also where we think \Nanimals first started Dialogue: 0,0:03:14.32,0:03:18.95,Default,,0000,0000,0000,,to get a threshold level \Nof genetic complexity Dialogue: 0,0:03:18.95,0:03:21.83,Default,,0000,0000,0000,,and pole body patterning genes \Ncalled Hox genes. Dialogue: 0,0:03:21.83,0:03:24.70,Default,,0000,0000,0000,,And that, coupled with the right \Nenvironmental conditions, Dialogue: 0,0:03:24.70,0:03:27.07,Default,,0000,0000,0000,,and serendipitous fossilization, Dialogue: 0,0:03:27.07,0:03:30.87,Default,,0000,0000,0000,,catalyzed its incredible \Nradiation of animal diversity Dialogue: 0,0:03:30.87,0:03:33.58,Default,,0000,0000,0000,,best known from the Cambrian explosion. Dialogue: 0,0:03:33.58,0:03:37.48,Default,,0000,0000,0000,,Also in this group is, we think,\Nthe appearance of the first penis. Dialogue: 0,0:03:37.48,0:03:40.36,Default,,0000,0000,0000,,And as I've raised that subject, Dialogue: 0,0:03:40.36,0:03:44.28,Default,,0000,0000,0000,,I have to talk about one modern \Nrepresentative, the turbellarians. Dialogue: 0,0:03:44.28,0:03:48.66,Default,,0000,0000,0000,,These guys have not one, \Nbut two penises that are hypodermic. Dialogue: 0,0:03:48.66,0:03:50.49,Default,,0000,0000,0000,,And they joust with them. Dialogue: 0,0:03:50.49,0:03:53.33,Default,,0000,0000,0000,,And the first one to jab its sperm \Ninto the other gets to be the boy, Dialogue: 0,0:03:53.33,0:03:56.07,Default,,0000,0000,0000,,while the jab-ee gets to be the girl. Dialogue: 0,0:03:56.07,0:03:59.43,Default,,0000,0000,0000,,And this remarkable behavior\Nis aptly called penis-fencing. Dialogue: 0,0:03:59.43,0:04:01.26,Default,,0000,0000,0000,,Go figure.\N(Laughter) Dialogue: 0,0:04:01.26,0:04:03.87,Default,,0000,0000,0000,,OK, moving on to the fourth: \Nwe have the annelids. Dialogue: 0,0:04:03.87,0:04:09.85,Default,,0000,0000,0000,,These animals have \Na body cavity called the coelom. Dialogue: 0,0:04:09.85,0:04:14.18,Default,,0000,0000,0000,,And they're known by having these \Nlittle rings running down their bodies. Dialogue: 0,0:04:14.18,0:04:16.75,Default,,0000,0000,0000,,What these guys brought \Ninto the animal world Dialogue: 0,0:04:16.75,0:04:21.66,Default,,0000,0000,0000,,was the ability to penetrate into the soil,\Nbring oxygen in and release carbon dioxide. Dialogue: 0,0:04:21.66,0:04:24.01,Default,,0000,0000,0000,,And releasing carbon dioxide\Nactually helped Dialogue: 0,0:04:24.01,0:04:26.84,Default,,0000,0000,0000,,to heat the planet up and make it \Nmore livable for other life. Dialogue: 0,0:04:26.84,0:04:29.51,Default,,0000,0000,0000,,Now we've got too much CO2, \Nbut at the time, Dialogue: 0,0:04:29.51,0:04:32.30,Default,,0000,0000,0000,,this was really an important thing\Nthat the annelids brought to the planet – Dialogue: 0,0:04:32.30,0:04:34.60,Default,,0000,0000,0000,,Bioturbation. Okay. Dialogue: 0,0:04:34.60,0:04:38.37,Default,,0000,0000,0000,,Our next plan we've got are the mollusks.\NAmazing phylum. Dialogue: 0,0:04:38.37,0:04:41.42,Default,,0000,0000,0000,,Tiny little shelled animals to giant squid. Dialogue: 0,0:04:41.42,0:04:44.26,Default,,0000,0000,0000,,All characterized by a single slimy foot. Dialogue: 0,0:04:44.26,0:04:47.76,Default,,0000,0000,0000,,And what the mollusks show us, \Nmost of them are shelled. Dialogue: 0,0:04:47.76,0:04:52.58,Default,,0000,0000,0000,,And we can see in the mollusk phylum \Nis this arms race escalation, Dialogue: 0,0:04:52.58,0:04:55.50,Default,,0000,0000,0000,,with shells becoming \Nmore increasingly complex Dialogue: 0,0:04:55.50,0:05:00.14,Default,,0000,0000,0000,,in response to more complex predation \Nfrom other phyla, Dialogue: 0,0:05:00.14,0:05:03.22,Default,,0000,0000,0000,,so they kind of exemplify \Nan arms race escalation, Dialogue: 0,0:05:03.22,0:05:06.21,Default,,0000,0000,0000,,with some of them actually \Ndoing away with the shell completely, Dialogue: 0,0:05:06.21,0:05:11.22,Default,,0000,0000,0000,,trading it for smarts and psychedelic skin \Nthat we see in the squid and the octopus. Dialogue: 0,0:05:11.22,0:05:13.99,Default,,0000,0000,0000,,And these are the guys\Nwho can change color Dialogue: 0,0:05:13.99,0:05:17.00,Default,,0000,0000,0000,,and texture of their skin\Nin split-seconds, Dialogue: 0,0:05:17.00,0:05:19.89,Default,,0000,0000,0000,,the rockstars of the mollusk phylum.\NGotta love these guys. (Laughter) Dialogue: 0,0:05:19.89,0:05:21.98,Default,,0000,0000,0000,,And they can even be bipedal! Dialogue: 0,0:05:21.98,0:05:26.03,Default,,0000,0000,0000,,Okay, our next phylum are \Nthe echinoderms, the spiny-skinned guys. Dialogue: 0,0:05:26.03,0:05:29.96,Default,,0000,0000,0000,,The sea stars, sea urchins,\Nand sea cucumbers. Dialogue: 0,0:05:29.96,0:05:33.80,Default,,0000,0000,0000,,And they're characterized by \Nan internal skeleton of little plates Dialogue: 0,0:05:33.80,0:05:37.91,Default,,0000,0000,0000,,that can lock together with \Nvery little energy expenditure. Dialogue: 0,0:05:37.91,0:05:40.92,Default,,0000,0000,0000,,And underneath are these tube feet \Nthat allow them to move Dialogue: 0,0:05:40.92,0:05:43.28,Default,,0000,0000,0000,,and shuttle food to their central mouth. Dialogue: 0,0:05:43.28,0:05:45.17,Default,,0000,0000,0000,,Now, these are a complex animal, Dialogue: 0,0:05:45.17,0:05:47.61,Default,,0000,0000,0000,,but they decided to do away\Nwith bilateral symmetry, Dialogue: 0,0:05:47.61,0:05:49.92,Default,,0000,0000,0000,,they have a five-part symmetry. Dialogue: 0,0:05:49.92,0:05:51.83,Default,,0000,0000,0000,,And they have no brain. Dialogue: 0,0:05:51.83,0:05:57.58,Default,,0000,0000,0000,,And they seem like they don't do much, \Nthey just sit there on the sea floor. Dialogue: 0,0:05:57.58,0:06:01.25,Default,,0000,0000,0000,,But you speed them up in timelapse and \Nyou see that they're incredibly industrious. Dialogue: 0,0:06:01.25,0:06:05.08,Default,,0000,0000,0000,,And they actually comprise the bulk \Nof the biomass in the deep sea environment. Dialogue: 0,0:06:05.08,0:06:07.33,Default,,0000,0000,0000,,Very successful body plan. Dialogue: 0,0:06:07.33,0:06:10.66,Default,,0000,0000,0000,,Our next one, the true rulers \Nof the planet, the arthropods. Dialogue: 0,0:06:10.66,0:06:15.48,Default,,0000,0000,0000,,Now, if you look at all the animals,\Nthe arthropods comprise the bulk. Dialogue: 0,0:06:15.48,0:06:18.14,Default,,0000,0000,0000,,Eighty percent are arthropods. Dialogue: 0,0:06:18.14,0:06:23.95,Default,,0000,0000,0000,,If you added up the biomass of humans,\Nthey are 300 times the biomass of all humans. Dialogue: 0,0:06:23.95,0:06:26.50,Default,,0000,0000,0000,,And most of them are insects! Dialogue: 0,0:06:26.50,0:06:31.08,Default,,0000,0000,0000,,Did you know that four out of five\Nanimals have six legs? Dialogue: 0,0:06:31.08,0:06:36.53,Default,,0000,0000,0000,,So, these are the first guys \Nthat walked out of the ocean Dialogue: 0,0:06:36.53,0:06:38.50,Default,,0000,0000,0000,,and started to explore at land. Dialogue: 0,0:06:38.50,0:06:40.75,Default,,0000,0000,0000,,They were the first ones \Nthat took to the skies. Dialogue: 0,0:06:40.75,0:06:45.40,Default,,0000,0000,0000,,100 millions of years before the birds \Never thought of doing such a thing. Dialogue: 0,0:06:45.40,0:06:47.27,Default,,0000,0000,0000,,So, what is the secret to their success? Dialogue: 0,0:06:47.27,0:06:50.22,Default,,0000,0000,0000,,How are they able to be in \Nevery environment imaginable? Dialogue: 0,0:06:50.22,0:06:53.28,Default,,0000,0000,0000,,Well, it has something to do \Nwith that outside skeleton, Dialogue: 0,0:06:53.28,0:06:54.92,Default,,0000,0000,0000,,their exoskeleton. Dialogue: 0,0:06:54.92,0:06:56.100,Default,,0000,0000,0000,,And their diversity of appendages \Ndown their body, Dialogue: 0,0:06:56.100,0:06:58.67,Default,,0000,0000,0000,,like a little Swiss army knife. Dialogue: 0,0:06:58.67,0:07:01.17,Default,,0000,0000,0000,,They can have multiple antennae,\Nmultiple legs, multiple wings, Dialogue: 0,0:07:01.17,0:07:05.03,Default,,0000,0000,0000,,multiple reproductive organs,\Nit's just an amazing attribute Dialogue: 0,0:07:05.03,0:07:09.64,Default,,0000,0000,0000,,that allows them to infiltrate \Nevery habitable space on the planet. Dialogue: 0,0:07:09.64,0:07:13.14,Default,,0000,0000,0000,,And the last phylum, the chordates. Dialogue: 0,0:07:13.14,0:07:17.10,Default,,0000,0000,0000,,This is, of course, where we originated \Nover 550 million years ago. Dialogue: 0,0:07:17.10,0:07:20.31,Default,,0000,0000,0000,,And it's characterized \Nby having a spinal cord, Dialogue: 0,0:07:20.31,0:07:23.94,Default,,0000,0000,0000,,right there you see in pink, \Nthat blossoms into a brain in vertebrates, Dialogue: 0,0:07:23.94,0:07:26.58,Default,,0000,0000,0000,,and underneath a notochord, Dialogue: 0,0:07:26.58,0:07:29.66,Default,,0000,0000,0000,,which turns into a bony spinal column \Nin the vertebrates as well. Dialogue: 0,0:07:29.66,0:07:32.89,Default,,0000,0000,0000,,And this is all the guys that \Nmake the silver screen all the time. Dialogue: 0,0:07:32.89,0:07:37.63,Default,,0000,0000,0000,,The mammals, and the amphibians, \Nand the reptiles, and of course, the fish. Dialogue: 0,0:07:37.63,0:07:40.50,Default,,0000,0000,0000,,The bulk of the chordates are the fishes. Dialogue: 0,0:07:40.50,0:07:43.13,Default,,0000,0000,0000,,And these are all the guys \Nwe know and love. Dialogue: 0,0:07:43.13,0:07:47.35,Default,,0000,0000,0000,,And of course, the fish – Dialogue: 0,0:07:47.35,0:07:50.83,Default,,0000,0000,0000,,that's one of my favorite fish, \Nthe mola mola. Dialogue: 0,0:07:50.83,0:07:54.11,Default,,0000,0000,0000,,And it includes our kin, \Nour land-loving hominids. Dialogue: 0,0:07:54.11,0:07:56.17,Default,,0000,0000,0000,,These are my little ones. Dialogue: 0,0:07:56.17,0:07:59.38,Default,,0000,0000,0000,,So that's the basic eight, Dialogue: 0,0:07:59.38,0:08:06.05,Default,,0000,0000,0000,,and, I think, to recap,\Nwhy don't we do that with a song? Dialogue: 0,0:08:06.05,0:08:09.72,Default,,0000,0000,0000,,Alright, you guys ready? Okay. Dialogue: 0,0:08:09.72,0:08:12.23,Default,,0000,0000,0000,,And now, a song. Dialogue: 0,0:08:12.23,0:08:16.03,Default,,0000,0000,0000,,The sponges started everything,\Npumping up a storm, Dialogue: 0,0:08:16.03,0:08:18.53,Default,,0000,0000,0000,,...among the ruckus, \Nthe rest of us was born. Dialogue: 0,0:08:18.53,0:08:21.70,Default,,0000,0000,0000,,Cnidarians muscled up, \Nmixed nerves into the potion, Dialogue: 0,0:08:21.70,0:08:25.14,Default,,0000,0000,0000,,and with that quick addition\Ngot us brand-new locomotion. Dialogue: 0,0:08:25.14,0:08:28.54,Default,,0000,0000,0000,,The flattish worm-like hunters \Ngot a head and then some traction, Dialogue: 0,0:08:28.54,0:08:31.92,Default,,0000,0000,0000,,and with some senses and a penis – \NOooh! – scored some action. Dialogue: 0,0:08:31.92,0:08:33.95,Default,,0000,0000,0000,,The shape of life, yeah. Dialogue: 0,0:08:33.95,0:08:38.82,Default,,0000,0000,0000,,And here we have penis fencing \Nin flagrante delicto. Dialogue: 0,0:08:38.82,0:08:45.27,Default,,0000,0000,0000,,The shape of life, yeah... Dialogue: 0,0:08:45.27,0:08:48.60,Default,,0000,0000,0000,,Now, being male and female,\Nthat just works out great, Dialogue: 0,0:08:48.60,0:08:52.43,Default,,0000,0000,0000,,anybody in the world\Ncan double as your date. Dialogue: 0,0:08:52.43,0:08:55.60,Default,,0000,0000,0000,,Then all hell broke loose \Nand the other plans appeared. Dialogue: 0,0:08:55.60,0:08:58.85,Default,,0000,0000,0000,,The Cambrian exploded, \Nlaunched the world into high gear. Dialogue: 0,0:08:58.85,0:09:02.35,Default,,0000,0000,0000,,The annelids took to the dirt \Nand bioturbatin'. Dialogue: 0,0:09:02.35,0:09:05.88,Default,,0000,0000,0000,,The mollusks took to fighting\Nand arms race escalating. Dialogue: 0,0:09:05.88,0:09:08.92,Default,,0000,0000,0000,,Echinos said, "The heck with this,\Nwe're better off instead Dialogue: 0,0:09:08.92,0:09:12.74,Default,,0000,0000,0000,,taking life into the slow land,\Nlopping off that head." Dialogue: 0,0:09:12.74,0:09:16.09,Default,,0000,0000,0000,,Arthros stepped onto the land \Nand ruled, that ain't no mystery, Dialogue: 0,0:09:16.09,0:09:19.43,Default,,0000,0000,0000,,till bonehead chordates followed \Nand soon would rewrite history. Dialogue: 0,0:09:19.43,0:09:22.15,Default,,0000,0000,0000,,The shape of life, yeah... Dialogue: 0,0:09:22.15,0:09:24.68,Default,,0000,0000,0000,,Okay, very good!\N(Applause) Dialogue: 0,0:09:30.87,0:09:35.60,Default,,0000,0000,0000,,So why study these mostly \Nslimy, spineless critters Dialogue: 0,0:09:35.60,0:09:39.35,Default,,0000,0000,0000,,with whom we co-pilot spaceship Earth? Dialogue: 0,0:09:39.35,0:09:41.33,Default,,0000,0000,0000,,Well, were it not for them, \N Dialogue: 0,0:09:41.33,0:09:44.55,Default,,0000,0000,0000,,none of us would be strutting and \Nfretting our ten minutes upon this stage. Dialogue: 0,0:09:44.55,0:09:47.69,Default,,0000,0000,0000,,It's the animal life and \Nall the life that came before us Dialogue: 0,0:09:47.69,0:09:51.23,Default,,0000,0000,0000,,and with whom we share this planet \Nthat not only set the stage, Dialogue: 0,0:09:51.23,0:09:55.13,Default,,0000,0000,0000,,but created the very stage for all life \Nto flourish in the future. Dialogue: 0,0:09:55.13,0:09:58.35,Default,,0000,0000,0000,,And I can't put it any more eloquently \Nthan E. O. Wilson, who says: Dialogue: 0,0:09:58.35,0:10:03.67,Default,,0000,0000,0000,,"Humanity is exalted, not because \Nwe are so far above every thing living, Dialogue: 0,0:10:03.67,0:10:07.94,Default,,0000,0000,0000,,but because knowing them well\Nelevates the very concept of life." Dialogue: 0,0:10:07.94,0:10:09.69,Default,,0000,0000,0000,,Thank you. Dialogue: 0,0:10:09.69,0:10:13.69,Default,,0000,0000,0000,,(Applause)