Constructive force Is what you’re looking for
<span>phagocytosis, otherwise known as "cell eating". The cell takes it in by squeezing it through the cell membrane and creating a vesicle.</span>
C) Things need to keep moving about and sexual selection allows for preference towards a particular "look". Just going with instinct
<u>Answer</u>: There are numerous factors that influence the behavior and physiology of an individual animal/plant etc. By doing the study in their natural environment, you remove any possible bias caused by this.
Furthermore, an individual's behavior will differ in an artificial experimental setup compared to that observed in a natural setting. When possible, studying the subject in its natural environment is the best experimental method.