Jacob wants to learn how he can help ensure that the biodiversity of earth no longer decreases. which topic should he research? A. reducing pollution and preserving wildlife habitat.

B. areas on earth with large amounts of un-mined coal.

C. demand of rainforest timber and exotic animal's

D. energy generated from wild and high-cost windmills

C. demand of rainforest timber and exotic animal's

Explanation:

Biodiversity refers to the combination of biological and diversity. In this, it shows the varieties of life than could be found on earth in terms of plants, animals, etc

For not reducing the biodiversity on earth, Jacob should be researched  on rainforest timber demand and the exotic demand so that the biodiversity could not decline

Therefore the option c is correct

Hence, all the other options are wrong.