Biodiversity is measured by

counting the number and variation of different species of plants, animals, and other organisms that interact within an ecosystem.
• counting the total number of one species population and how they interact within an ecosystem.
examining the usefulness of a specific trait in a species that interacts within an ecosystem.
• only analyzing animal species that interact within an ecosystem.

counting the number and variation of different species of plants, animals, and other organisms that interact within an ecosystem.