instruction:
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.
question:
Fact 1: Hair helps to insulate and protect the body. 
Fact 2: Hair is used to insulate and keep the body warm in a large variety of climates.
answer:
Hair helps to keep the body warm and protect it in a variety of climates.


question:
Fact 1: planting trees has a positive impact on an ecosystem. 
Fact 2: Biodiversity encourages a healthier ecosystem.
answer:
planting trees has a positive impact on biodiversity.


question:
Fact 1: Heterotrophs are living things that cannot make their own food. 
Fact 2: Mammals depend on the vegetation for food and shelter.
answer:

Mammals are Heterotrophs.