The correct option is D Famous for popularising the term ‘biodiversity’
Biodiversity is defined as the variety and variability observed at all levels of biological organisation. Sociobiologist Edward O. Wilson was the first person to popularise the term ‘biodiversity' to describe the differences observed amongst living organisms at different levels of organisation. Thus he is known as the father of biodiversity.
Ernst Haeckel is known as the Father of Ecology. He was a German zoologist who discovered, described and named thousands of new species, mapped a genealogical tree relating all life forms, and coined many terms in biology, including 'ecology', 'phylum', 'phylogeny', and 'Protista'.
Joel A. Allen is known for the famous Allen’s rule that states that organisms living in colder regions have shorter extremities to reduce heat loss.
Gregory Gause is famous for his principle of competitive exclusion. The principle states that when two species residing in the same habitat have the same requirements for survival, they compete and fight for the resources, until the superior species eliminates the inferior one.