Simple Animals: Sponges, Jellies, & Octopuses – Crash Course Biology #22

Hank introduces us to the “simplest” of the animals, complexity-wise: beginning with sponges (whose very inclusion in the list as “动物” has been called into question because they are so simple) and finishing with the most complex molluscs, octopuses and squid. We differentiate them by the number of tissue layers they have, and by the complexity of those layers.

Crash Course Biology is now available on DVD! 在家DIY的最佳美甲://dft.ba/-8css

Like CrashCourse on Facebook: 在家DIY的最佳美甲://感谢以下赞助人每月的慷慨捐助，帮助大家永远免费使用速成课程
Follow CrashCourse on Twitter: 在家DIY的最佳美甲://www.twitter.com/TheCrashCourse

Table of Contents:
1) Porifera 1:33
2) Cnidaria 2:36
一种) Diploblasts 2:48
3) Platyhelminthes 3:33
一种) Triploblasts 3:56
b) Coelom 4:36
4) Biolography 5:36
5) Nematoda 7:26
6) Rotifera 7:57
7) Molusca 8:33

References for this episode can be found in the Google document here: 在家DIY的最佳美甲://dft.ba/-2V_c

crash course, 生物学, anatomy, 动物, simple, complex, tissue complexity, tissue, sponge, development, porifera, multicellular, eukaryotic, eukaryote, species, cnidaria, jellies, anemone, hydra, coral, germ layer, body cavity, endoderm, ecotoderm, dipoloblast, stinging cell, cnidocyst, platyhelminthes, fluke, triploblast, coelom, acoelomate, biolography, cambrian explosion, adaptation, fossil, evolution, diversity, nematoda, pseudocoelomate, hookworm, rotifera, mollusca, chitin, snail, bivalve, octopus, squid, visceral mass, foot, mantle, radula, gastropod, cephalopod Support CrashCourse on Patreon: ❤️情人节美甲💅教程#20nails://今天我们将探讨教育作为社会的历史