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 "animals" 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.

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

References:

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[charlieprott]

I really don't understand how anyone can dislike these videos...simplifies everything i learn in class

[jlong]

Sponges are fantastic
-very simple
-can't relate
-not too special
-the Pluto of animals

[meganriehle]

In 12 minutes you just explained what my professor, who has a doctorate in marine biology, has been trying to teach for six weeks. He has never made as much sense as this. Thank you!

[serrerwe]

Great great job! I have a biology degree and am doing some studying for an "invertebrate biology" class that's I'm taking as a refresher, this was perfect! Really, really well done. All the key points really fast, fully explained. I actually never had a proper explanation of the purpose/exact location of the coelom as I just received. As always, great work, I'll keep watching programs of yours where I don't have a background with great confidence that you've got it right!

[rynsawyer]

"They're like frickin' ocean ninjas! Cephalopods' got skills."

[renadam]

Hank is my hero. He's strung together several semesters of work on my end into a nice review for the jump to another university. Cool recap for exams for anyone just starting: great connections for those of use who've been to caught in the minutea to remember the big picture. Seriously: all those notes from classes a lifetime ago came back to me. Hank I don't give a crud how you or your team infer the plural of Octopus. This series is nicely done!

[torbenhamilton]

I thoroughly enjoy all of your videos, in fact I use them to help me study for Biology. You should make some crash course videos for calculus. That would help me so much.

[frog]

HANK IS AMAZING! i didnt really understand invertebrates in the ONE CLASS we had, and guess what, it carries the most marks in my 2nd term exam. thank you hank, from the bottom of my heart, in the most platonic way, i love you.

[daniellegarcia]

PLEASE MAKE A VIDEO ON Thumbs ups please.
I was like ok lets crash course it, and then "really, hank? no protozoo video?" :( :(

[VincePolevault]

This is exactly what youtube needs for every subject in school ever. Thank you for making videos about my favorite subject!

[s]

Thank you so much CrashCourse for these videos! They are such a huge help!

[amritasriv]

Can any channel be better than this??? I am in total love with this channel

[Yamikaiba]

Finally no more lame comments about AP tests.

[Dmartinez]

Please come teach at UConn, we need more teachers like this. WHY IS THIS NOT A THING PEOPLE?!

[kaseycoverdale]

bless crash course, I've been trying to do a zoology work sheet all night and could not find some answers except here. Thank you CrashCourse!!!!

[GarrigKitten]

"They're like fricken' ocean ninjas." I don't think I'd ever have heard that sentence anywhere else...

[erinkeiko]

Can I just get my bio credits from watch this series?
N-No? Okay...

[ScrapperTBP]

I love there to be a bit where you say "Except for...the sponges" before cutting to a picture of a motionless sponge as an anticlimax

[houstoncambodia]

The closed captioning spelled out: "Cephalopods got skillz".

[WildFyreful]

O: You stepped on a dead Man-of-War?! *winces and shudders*
I feel for you, Hank. I really do. 

I got a story similar to that - I got stung by a dead bee. :D It was cut in half too and my hideous luck made me land on my knee and jab it into my kneecap while bouncing on a cousin's trampoline in California. 

Wildfyreful: 0
Dead Bee: 1