Question

_____________ is the variety of life on Earth, on both the species and genetic levels. A) Biodiversity B) Biome C) Biosphere D) Speciation

Answer 1

the answer is a, biodiversity means a large variety 

Answer 2

Biodiversity is the variety of life on Earth, on both the species and genetic levels.
Biodiversity deals with the variety of life on Earth. Biome deals with organisms that have a similarity for the environment they live in. Biosphere is known as the sun of all ecosystems. Speciation is the process in evolution of a new organism.
So A, Biodiversity.