What is a riparian zone and why are they important to ecosystems
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Riparian areas supply food, cover, and water for a large diversity of animals and serve as migration routes and stopping points between habitats for a variety of wildlife. Trees and grasses in riparian areas stabilize streambanks and reduce floodwater velocity, resulting in reduced downstream flood peaks

Explanation:

couples could only have one child to reduce the population growth.

a system of cooperative federalism emerged, as the powers of the federal government expanded.