How Do Animals Work Together

Animals do not have cell walls, but do generally are multicellular, reproduce sexually and have gap junctions.
Animals are ingesting heterotrophs; fungi have absorptive nutrition.
Development order: fertilization, cleavages, blastula, gastrula and metamorphosis.
Ancestor of animals: protozoa (choanoflagelate)
Know Animal Taxonomy including Lophotrocozoa!!!!
Only animals have hox genes
Sponge=perifera=parazoa=lacks true tissue
Eumetazoa=everything besides sponge
Cephalization=sensory organs in head regions (anterior end), brain and bilateral symmetry
Mollusks=protostomes, annelids=protostomes, echinoderms=deuterostomes and chordates=deutersotomes.
Everything aside from radial and sponges=triploblast.
Deuterstome=coelomate and bilateral symmetry w/ triploblast
That's not the case with a snail/ protostome.
Humans=deuterstomes, coelomates, triploblasts, bilateral symmetry, eumetazoa.
Cambrian explosion=huge diversity of animal kingdom, different locomotion, different predator prey relations, hox gene evolution and O2 buildup. archenteron=deuterstome cartilege=condrifeus (?) amniotic egg and water-resistant skin=reptile reptiles successful in desert because of slow metabolism, ectothermic and scales snakes come from lizards internal fertilizaton=mammals, some sharks, birds