No organism is always the first step, except in a wide sense, plants. In the water, plankton is found in first but whereas on land, plants or seeds are eaten first.
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Plants may wilt because the soil is dry and the plants don't have enough to water to survive. If you add shade, this means that the sun no longer shines down directly on the soil, helping the soil stay damp. Less water evaporates from the soil, and the plants don't wilt as much.
