Life 103- Animals week 1
Life 103- Animals week 1 LIFE 103
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This 1 page Class Notes was uploaded by Alexis Darling on Monday March 28, 2016. The Class Notes belongs to LIFE 103 at Colorado State University taught by Jennifer L Neuwald; Tanya Anne Dewey in Fall 2016. Since its upload, it has received 11 views. For similar materials see Biology of Organisms-Animals and Plants in Biology at Colorado State University.
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Date Created: 03/28/16
~Ediacaran Origin when animals evolved ~Cambrian explosion time where nearly all animal diversity came from All animals are: ● Multicellular ● Motile at some stage in life ● Have unique, specialized cells (nerve and muscle) with exceptions ● Ingestive heterotrophs (take in matter to digest) Themes in Animal Evolution (points of diversion) chronologically 1. Multicellularity *Choanoflagellates are the unicellular sister group to animals 2. Bilateral symmetry/cephalization ● If bilaterally symmetrical, there is a head (cephalization) place where sensory apparatus and nervous system is concentrated; purpose to better direct movement 3. Embryonic tissue layers ★ Diploblastic 2 tissue layers ★ Triploblastic 3 tissue layers 4. Coelom =body cavity with fluid to allow nutrient movement *Only in triploblastic Three body plans: ● Acoelomate no coelom; region between digestive cavity and body covering is tissuefilled ● Coelomate true coelom completely surrounded by mesoderm ● Pseudocoelomate fake coelom; fluidfilled cavity between digestive tract and body covering (endoderm and mesoderm) 5. Development of stoma (openings) ★ Protostome mouth forms first ★ Deuterostome mouth forms second (first is the anus) 6. Segmentation Benefit: permits specialization of parts for specific functions
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