Classifying Animals: Digestion & Symmetry

While animals share many common characteristics, there are some characteristics unique to certain animal groups. In this video, I'll describe how we can classify animals by the type of digestion they have (incomplete or complete) and if they have complete digestion, if they are protostomes or deuterostomes. Animals can also be classified by their type of symmetry: asymmetry, bilateral symmetry, and radial symmetry.

[TourniquetTwin]

Immensely helpful! I wish my professor took the time to explain this, show us a Phylogenie tree instead of dropping a cryptic script for us to learn by heart, and buggering off.

[hananelwikeel]

Amazing explanation!!!🤩🤩
Keep going 💪❤

[human_isomer]

I'm not sure the symmetry is responsible for the speed of movement. Otherwise a snail would be much quicker, as some of them (the ones with a shell) have no symmetry at all. Which, by the way, are other animals besides the sponges that don't have symmetry. Of course one could argue that the shell is only a wound-up variant of a long-stretched conical housing, but actually, winding it up breaks the symmetry.