Concept:Ecology is the study of how living organisms interact with their surroundings.Explanation:Ecology covers both living and non-living components of the environment.It examines relationships among organisms and between organisms and factors such as air, water, soil, and climate.Options that mention only plants and animals or only habitat properties are incomplete.Therefore, the full and correct definition includes all organisms and their total environment.Answer:B. the interrelationship between organisms and their environment