Birds cannot breed where air is thinner because they cannot take in enough oxygen, so fewer species are found at high elevations. Polar and temperate regions are relatively species-poor because glaciation events repeatedly forced organisms toward tropical latitudes. Because penguins cannot fly, they are forced to remain in the Arctic, and there are few species of birds that can survive such harsh winters. Birds prefer to live near oceans, and proximity to the ocean has a great effect on bird diversity. Because polar bears prey on birds, there are few bird species that can live in the Arctic.

polar and temperate regions are relatively species poor because glaciation events relatively forced organisms toward towards tropical latitudes.

Explanation:

wetland functions are defined as a process or series of processes that take place within a wetland. these include the storage of water, transformation of nutrients, growth of living matter, and diversity of wetland plants, and they have value for the wetland itself, for surrounding ecosystems, and for people.

explanation:

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texas governor sam houston opposed secession, but was unable to prevent it. in this speech, given prior to lincoln's election, he presents the argument that slavery would be safer within the united states than outside of it. it was a prescient argument, and one held by several other southern leaders.

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