Concept:Variation is the term used in biology to describe differences in structure, form, and behavior among living organisms.
Explanation:The question asks for the name given to differences in structural, morphological, and behavioral features.
When plants and animals are compared, they show such differences, for example, in cell wall presence, body symmetry, and responses to stimuli.
In biology, variation is recognized as the normal range of differences between individual organisms or groups of organisms.
Adaptation refers to special characteristics that enable organisms to survive successfully in their environment.
Evolution means the gradual change in inherited traits of populations over many generations.
Succession is the orderly progression of species changes in an ecological community over time.
Since none of these three terms matches the idea of general observable differences, the correct answer is variation.
Answer:C. variation