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Test 3 Review Animal Development Draw the stages of animal development from zygote to gastrula. Be sure to include all intermediate stages. sperm + egg -> fertilization -> zygote -> morula -> blastula -> gastrulation -> gatrula What is a coelom ? What variations have existed during its evolution? a hollow body cavity with tissue surrounding all sides When did most animal phyla evolve? What is the name of this event? cambrian explosion, 500 mya What are the three tissue germ layers? When did they evolve in the history of animals? ectoderm, mesoderm, endoderm; after porifera What are some of the most broad classifications of animals? Think about metazoans vs eumetazoans, radiate vs. bilateria, protostomes vs. deuterostomes… no cell walls, true tissue, ingest food, sexual reproduction What four traits distinguish all chordates? hollow dorsal nerve cord, pharyngeal slits, post anal tail, nochord What is the neural crest?
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