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beavers are known for constructing dams in riparian ecosystems. these dams make moats around beaver lodges, which protect beavers from predators, as well as provide places for food storage and warmth during winter. these dams also create and maintain wetlands, which provide habitats for numerous other organisms, and filter out pollutants from (waterways. beavers are considered to be a keystone species in their ecosystems.
what will most likely happen to their ecosystem if beavers are removed?

a. biodiversity will decrease .
b. wetlands will become polluted.
c. riparian ecosystems will disappear.
d. beavers' predators will become extinct.