Question

1. which of the following is an example of responding to a stimulus? a flower turning towards the sun. a tree growing taller over the years. a dog sleeping through the night. a mushroom decomposing organic material.

Explanation:

Living organisms respond to stimuli in their environment. A flower turning towards the sun is a response to the light - a stimulus. A tree growing taller is a part of its growth process, a dog sleeping is a normal behavior, and a mushroom decomposing organic material is part of its life - cycle and ecological role, none of which are direct responses to a stimulus like light.

Answer:

A. A flower turning towards the sun.