An entomologist is a zoolist interested in insects. The are interested in finding and studying the classification of the life cycle, insects environments, how they relate to humans and their organisims
Constants are the factors that stay the same throughout the entire experiment no matter which group. The definition of a constant is "a situation or state of affairs that does not change." this furthers the point that constant is the correct answer because they don't change in the experiment.
The epithelium is the thin tissue forming the outer layer of a body's surface and lining the alimentary canal and other hollow structures. And if it damaged the rate of cell fixture is slowed.
