Biology 3229F/G Lecture Notes - Lecture 2: Sternum, Hydrozoa, Obelia

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Anemones, corals, jellyfish, and their kin tinofores organisms which we consider ancestors in the animal kingdom. Part of the ancestral animals have development and are multicellular. Part of the basal group other basal groups are the porifera and the placezoans, Not many of them but they dominate in some ecosystems coral reef. Very few fresh water cnidarians primarily marine, not terrestrial. West coast of vancouver island very diverse in invertebrates similar to the tropics. Described them first as plants obelia is a hydrozoan, diversified in its form. Plants have to photosynthesize using sunlight, but these organisms have to feed on other animals like zooplankton. Stuck to a rock, glued there with a petal disc (dark black in the matridium) and a crown of tentacles, with a mouth (oral disc) They bud off of one another some say they never die, they just continue to bud.

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