Official 52 Lec 2
Question 3 of 6
According to the professor, how do trees contribute to the successful spawning of salmon?

A.

They provide steams with nutrient that the salmon need

B.

They provide shade that keeps streams sufficiently cool

C.

They help salmon avoid predators by providing camouflage

D.

They reduce the amount of sediment entering streambeds

正确答案:BD

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