Which would be negatively affected by an increase in the beetle population?
A. frog
B. grass
C. robin
D. snake

Grass, Option B

Explanation:

If the beetle population increased then they would be eating more grass, which would negatively impact the ecosystem because you need everything stabilized in the environment.

B. grass

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i believe the answer is snake.

paper covers rock.

explanation:

rock only smashes scissors.