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C.

Explanation:

The pupil reflex is the reflex contraction and relaxation of the antagonistic muscles of the iris in response to changes in light intensity. It causes a change in the pupil size. The pupil dilates at low light intensities, and constricts at high light intensities.

The picture below shows how the muscles are relaxed and contracted. Hope this helps:]

producers within ecosystems are essential as they are at the base of the food chain. plants are examples of producers. they use the process of photosynthesis to capture light energy and use it to convert simple inorganic substances (carbon dioxide and water) into organic substances (glucose).