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-heterotrophs (however 1/3 are photosynthetic).
-may have formed by endosymbiosis (engulfed green algae cell)
-1/2 heterotroph, 1/2 photosynthetic
-2 flagella, one like belt, one like tail
-armor of cellulose plates
-zooxanthellae (those that have lost flagella and armor, live as symbionts in mollusks, sea anemones, jellyfish, and coral)
-also make coral more productive, limits coral to shallow water
-algal blooms of these are the cause of red tide--> potent toxins!
-spore-forming parasites. spores are passed from host to host by vectors (mosquitoes, etc.)
-causes malaria (plasmodium)
-parasite life cycle, with intermediate hosts
-most complicated unicellular organisms. many organelles and specialized structures
-move by numerous cilia
-complex contractile vacuole that drains wastes from the cell
-move by pseudopods (extend cell to form "false foot" and flow into cytoplasmic streaming)
-eat other protozoans, algae, multicellular creatures
-amoebic dysentry (entamoeba histolyca) infects the tropics!
-can enter nostrils while swimming and attack the brain (primary ameobic meningoencephalitis)
-marine forms (calcium carbonate)
-extend cytoplasmic podia along the spines (which function in feeding, swimming)
-abundant! form most of the world's limestone, marble and chalk
-make up the great pyramids
-abundant in fossil record, used by geologists to help identify layers of rock- indicator species
-brown algae, kelp, mostly marine
-largist protists!, but very thin
-rely on diffusion
-kelp forms the basis for major ecosystem along Pacific
-Sargassum forms large floating mats, major ecosystem
-abundant in freshwater, marine habitats
-so abundant, account for large percentage of oxygen in the atmosphere
-shells form deposits (diatomaceous earth) used in abrasives, talc, chalks
-red algae. mostly marine
-dominate salt water. elaborate life cycles.
-aquired through endosymbiosis
-agar from cell walls used for culture plates
-carrageen, thickening agent from cell walls. used for ice cream, lunch meats, cosmetics, and paint
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