The _____ stimulus for a male stickleback's aggressive actions is not the presence of the other male but the sight of its red underbelly.
A) sign
B) reflex
C) conditioned
D) modal

Question

Quizplus · Accepted Answer

The correct term is "sign stimulus," which refers to a specific feature or aspect of the environment that triggers a fixed action pattern or instinctive behavior in an animal. In this context, the red underbelly of another male stickleback acts as a sign stimulus that triggers aggressive behavior.

The _____ Stimulus for a Male Stickleback's Aggressive Actions Is