Question

how did wolves influence the way rivers flow in yellowstone? wolves decreased the elk population but did not have an impact on rivers. wolves decreased the elk population, allowing the trees to grow taller and stabilize the riverbanks. wolves did not affect the elk, who ate the roots of the trees and tore up the riverbanks with their hooves. wolves increased the elk population, who grazed the trees down more and let the rivers widen.

Explanation:

Wolves reduced elk population, decreasing grazing pressure. This allowed trees to grow, whose roots stabilized riverbanks, influencing river flow.

Answer:

B. Wolves decreased the elk population, allowing the trees to grow taller and stabilize the riverbanks.