TASK DEFINITION: Combine the given two facts to write a concluding fact. Note that there should be some parts of the first and second facts that are not mentioned in this conclusion fact. Your combined fact should be the result of a chain between the two facts. Chains form when two facts connect together to produce a concluding fact. An example of a chain is: "pesticides cause pollution" (fact1) + "pollution can harm animals" (fact2) → "pesticides can harm animals" (conclusion fact). Parts of the concluding fact overlap with the first and the second fact. To construct such a  concluding fact, a useful way is to borrow the subject from one fact and the ending conclusions from another fact.
PROBLEM: Fact 1: Communities consist of populations of different species. 
Fact 2: Biodiversity is a lot more than just the number of different plant and animal species.

SOLUTION: Communities consist of populations that are biodiverse.

PROBLEM: Fact 1: rest has a positive impact on a health. 
Fact 2: Health is essential to a quality life.

SOLUTION: rest is essential to quality of life.

PROBLEM: Fact 1: Mammals have a layer of fat under the skin to help insulate the body. 
Fact 2: Glass insulation keeps beverage warm for hours.

SOLUTION:
Mammals have a layer of fat under the skin to keep them warm.