Answer and explanation

Correct answer: D. The variety of ecosystems, species and genetic differences within a species

  1. Step 1: Biodiversity has three levels. Step 2. They are ecosystem, species and genetic diversity. Answer: the variety at these three levels. Why not the others: these are abundance, biomass and productivity.

Practise more Ecology, Evolution and Immunity.

Free questions with an explanation for every one, and full timed Scottish Highers mock tests.