Question

multiple - choice question
which of the following is an example of an organism responding to internal stimuli?
a plant moving toward sunlight.
a marathon runner collapsing due to low blood sugar and not enough water.
a person running away from a bear.

Explanation:

Internal stimuli come from within an organism. A plant moving toward sunlight is a response to an external light - based stimulus. A person running away from a bear is a response to an external threat. A marathon runner collapsing due to low blood sugar (internal energy - related issue) and lack of water (internal hydration issue) is a response to internal stimuli.

Answer:

B. A marathon runner collapsing due to low blood sugar and not enough water.