The rain forest canopy has trees of varying heights growing to reach the sunlight. what kind of interaction does this demonstrate?

The correct answer will be competition.

Explanation:

Each forest is divided vertically into several layers forming a biologically complex living space due to the different height of the trees and the plants.

This vertical layering in the forest is known as "stratification" which is caused by the main factor of sunlight. Trees show this vertical layering in the forest in response to sunlight so that they can receive maximum sunlight from the sun to prepare the food for them.  

This is a competitive type of interaction for survival with members of the same species or different species.

Thus, competition is the correct answer.

the sphincter muscles at the end of the digestive tract is the anus.

the food storage products of chrysophytes are oils or the polysaccharide laminarin.   formerly classified as plants, the chrysophytes contain the photosynthetic pigments chlorophyll a and c all but the yellow-green algae also contain the carotenoid pigment fucoxanthin.