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.

Fact 1: if an animal sweats then that animal 's bodily water decreases. 
Fact 2: Human beings are group animals.
sweating reduces a human's bodily water.

Fact 1: Mammalian teeth are important for digestion. 
Fact 2: For instance, bacteria in the digestive tract helps glean the most nutrients from food.
Mammalian teeth are important for gleaning nutrients from food.

Fact 1: increasing heat causes thermal expansion. 
Fact 2: Heating by direct heat is usually too hot.

Making an object hot causes thermal expansion.