Biology, 22.09.2019 21:30, pedavis6609

Why are there usually so few organisms at the top level of a pyramid of energy?

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Biology, 22.06.2019 08:00, cailinhannon4828

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Biology, 22.06.2019 18:00, barnhill4755

The images show two species of tree frogs in a particular region. the gray tree frogs are adapted to the trees of the woodlands, while the green tree frogs can survive in woodlands or grasslands. the gray frog was abundant in the woodlands. because of climatic changes, most of the trees in the region died, and the woodlands changed to grasslands. in such a case, the . the gray tree frog is closely related to the green tree frog genetically, but they have different mating calls. this suggests that speciation occurred because of .