a - gemmules-The movement of water thru sponge is key for...

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AP Biology Campbell Textbook Notes Sponges - Animals, multicellular, heterotrophic, no cell walls, few specialized cells - Choanocytes (specialized cells use flagella to move current of water thru sponge, trap food particles). - Osculum (large hole at top) - Spicule (made of calcium carbonate or silica; makes skeleton of hard sponges, captures sunlight and directs the sunlight to cells below surface of cells, these cells photosynthesize) - Archaeocytes (specialized cells that move around within the walls of the sponge, complete digestive process, carry sperm to egg, groups of archaeocytes covered by spicules are called
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Unformatted text preview: gemmules)-The movement of water thru sponge is key for feeding (intracellular), reproduction (sexually: internal fertilization – eggs fertilized in body, zygote develops called larvae which are motile, asexually : thru budding, part of sponge breaks off and grows/ or it produce gemmules, which later become a new sponge ), circulation, excretion, response (no nervous systems, produce toxins)-Commensalism relationships w/ photo bacteria, algae, plant protists, which provide O2 and sponge provides shelter....
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