Biology 2483A Lecture Notes - Hyporheic Zone, Photic Zone, Cactus

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What the world is made up of biologically. There are many systems in the world and they relate to climate factors. Large biological communities that we can divide organisms up into based on the physical environment, climate in particular. Biomes are organized by dominant plant types (not taxonomy) such as the tundra or boreal forest. Plants make up a large majority of the worlds biomass. Since plants cannot move, they are forced to deal with the temperature conditions year round. It is difficult to describe a region based on animals because they can migrate when weather conditions change. Terrestrial biomes are characterized by succulence (leaves holding water) and deciduousness (leaves falling off) Deciduous: these trees are common in north america. Cacti: these plants have adapted to a very dry environment. Grasses: grasses are different from other plants because they are not woody and they grow from their base (no stem).

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