Question

1. which of the following is a response to an external stimulus?

○ migration
○ thirst
○ pain
○ hunger

Explanation:

• Thirst, pain, and hunger are internal stimuli (related to body's internal needs like fluid balance, tissue damage, or energy requirements).
• Migration is often a response to external stimuli such as seasonal changes (e.g., temperature, food availability changes with seasons which are external to the organism).

Answer:

migration