Which of the following most likely describes how the interaction between bears and salmon influences nitrogen dynamics in the environment?
a. when bears consume salmon, they leave parts of the carcasses on the ground, which decompose, releasing nitrogen into the environment
b. when salmon swim upstream to spawn, bears migrate to the rivers, and deposit nitrogen from the forest with their excrement
c. bears are a reservoir for nitrogen because they are the top consumer in the environment
d. bears urinate in rivers and streams which provides nitrogen for the salmon
Answer: A