BIOL 1011 Chapter Notes - Chapter 18: Trochophore, Water Vascular System, Decomposer
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Cells held together by structural proteins (collagen) and intercellular junctions. Ingestion- : male and female adults make haploid gametes by meiosis, egg and sperm join, making a zygote, zygote divides in mitosis, blastula , hollow ball of cells, is formed, gastrula . 18. 2 animal diversification began more than half a billion years ago. Transformation from zygote to adult is controlled by homeotic genes. Most fossils found don"t seem to be related to any living organisms, except. Animal diversification was rapid during the cambrian period. Cambrian animals had hard body parts like shells. Increased predator prey relationships and increase oxygen could have caused. 35 animal phyla: 1 phylum is . 18. 3 animals can be characterized by basic features of their body plan . Radial symmetry - body parts radiate from center like a wheel. Bilateral symmetry - exact same left and right sides the cambrian explosion. Group of cells with similar function and structure.
