Comparative Anatomy: What Makes Us Animals - Crash Course Biology #21

Hank introduces us to comparative anatomy, which studies the similarities and differences in animal anatomy to support the theory of evolution and the shared ancestry of living things.

References:
Campbell Biology, 9th ed.
CliffsAP Biology, 3rd ed.
Divergence time estimates for the early history of animal phyla...

Table of Contents:
1) Comparative Anatomy 0:00
2) Locomotion 1:19
3) Heterotophy 1:41
4) Convergent Evolution 2:40
5) Biolography 3:40
6) Tissues 6:00
a) Epithelial Tissue 6:11
b) Connective Tissue 6:33
c) Muscle Tissue 7:01
d) Nerve Tissue 7:14
7) Organs 7:32
8) Organ Systems 7:39

Want to find Crash Course elsewhere on the internet?

[playlist]

Hank is more closely related to the plant because they're both green.

[florance]

"unless you are a sponge" is like John's "wait for it... the Mongols!" :D

[_Tris_]

I love watching these. They re-cap all of the info that I'm learning at Uni. But with Hank Green as the professor which makes it a much more enjoyable experience :)
Thanks Hank!! And thanks to everyone that works on CrashCourse behind the scenes!

[bllackbllade]

That sponge joke gets me every time ! Keep it up guys, you clearly understand how to pass on information (as oposed to my teachers).

[izzysmith]

"Unless you're a sponge" in becoming like the "Except for the Mongols" in CC World History.

[PulseCodeMusic]

Who els is not cramming for exams and just interested in the universe enough to do these courses for the hell of it? Keep it up Hank your smashing it! :)

[liamheigis]

I love how the "unless you're a sea sponge" is kinda the same as "unless you're the mongols."

[Doomroar]

Henry Huxley what a baddass, i like this guy!

[oOoKaylaGirloOo]

I love Hank Green, he's all over the science part YouTube and he's hilarious all the time, keep on rockin hank!

[Heather-edlv]

Nobody:
Hank: except if you’re a sponge

[TheChristianCommando]

I think we deserve a video on purely on sea sponges!

[FirstRisingSouI]

I have a hypothesis: sponges are Mongols.

[udochiadiukwu]

2:19 when he does that jazzy walk has become my new favourite thing

[XhanAnimations]

I love just hearing something along the lines of "Every creature does it" immediately followed by "unless you're a sponge" xD

[summeliorquamtuum]

Anatomy is my favorite part of biology, so I'm really excited for the next few videos! You do great work, Hank!

[EmoNinjaGirl]

I'm beginning to get that sea sponges are "the exception" to like, everything...

Are sea sponges aliens? O3o

[Turritopsisify]

I'd love a whole series of lessons on taxonomy Hank, from kingdom to species! That'd be awesome. :D

[joses]

NOBODY INVITED ME FOR ANY REUNION! Well, maybe that's because I'm a sponge... :(

[justwhateverr]

I just found this channel and im pretty sure im going to spend the rest of my day watching these video.

[FoobarMagnum]

I'd just like to thank both Green brothers for making such fun, interesting to watch and instructive videos. It's my regular dose of science, it helps me being a better and more educated person.