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Unformatted text preview: Chapter 29: Animal Phylogeny, Acoelomates, and P rotostomes Cambrian period These creatures had lived on the muddy sediments of a shallow ocean basin Underwater avalanche buried them in a rain of silt that was eventually compacted into finely stratified shale Tectonic activity uplifted it All animals share certain structural and behavioral characteristics Eukaryotic, multicellular organisms, lack cell walls. Heterotrophs o Use oxygen to metabolize the food they eat through the biochemical pathways of aerobic respiration, and most store excess energy as glycogen, oil, or fat Motile o Able to move from place to place at some time in their lives o Fostered the evolution of locomotor structures including fins, legs, and wings. Sessile-unable to move from one place to another o Mussels and barnacles Embryo develops into a sexually immature juvenile or a free-living larva , which becomes a sexually mature adult. o Larva often differ markedly from adults and they may occupy different habitats and consume different foods....
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This note was uploaded on 03/31/2009 for the course LIFESCI Life scien taught by Professor Lorenz,t.c. during the Spring '09 term at UCLA.
- Spring '09