Question

which scenario describes a way that a biotic factor can impact a freshwater ecosystem?
a decrease in the bottom temperature of a lake can affect fish activity
a decrease in the salinity of an estuary can affect which fish can survive
an increase in a river fish population can increase competition
an increase in sunlight can increase the temperature

Explanation:

Biotic factors are living components of an ecosystem. A fish population is a biotic factor. An increase in the river fish population leading to more competition is an example of a biotic - biotic interaction. Temperature, salinity, and sunlight are abiotic factors.

Answer:

C. An increase in a river fish population can increase competition