BIO SCI 94 Chapter Notes - Chapter 33-56: Symmetry In Biology, Cambrian Explosion, Blastomere

• School: UC-Irvine
• Department: Biological Sciences
• Course: BIO SCI 94
• Professor: Robin Bush

Document Summary

Multicellular, heterotrophic eukaryotes- that lack cell walls - & ingest (eat) their prey. 30-35 phyla & many number (approx 8 million or more) species. Cambrian explosion : the rapid diversification of animals body types & lineages. Ecm ( includes proteins specialized for cell-cell adhesion & Heterotrophs ( get their carbon compounds from other organisms) Has neurons & muscle cells (except for sponges)|| enables movement. Fungi & animals similarity: multicellular heterotrophs & digest & absorb nutrients. Animals are the only multicellular heterotrophs to ingest their food before digestion. Animals are the largest: herbivores, detritivores, & predators on earth. Animals: monophyletic group that originated from a protist similar to choanoflagellates. Basic tool kit emerged for multicellular organisms- root of animal lineage. Sponges lack organized & complex tissues other than: rudimentary epithelium. Some of the genes responsible for bilateral symmetry came up before the split of ctenophores & cnidarians. Bilaterians: centralized nervous system & cephalized bodies.