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.
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Question: Fact 1: Mammals generate heat mainly by keeping their metabolic rate high. 
Fact 2: Humans use food to generate body heat.

Answer: food keeps mammals' metabolic rates high.


Question: Fact 1: dew is formed when water vapor condenses over night. 
Fact 2: Dew begins to evaporate when the temperature reaches the dew point.

Answer: condensed water vapor evaporates at certain temperatures.


Question: Fact 1: Birds move their wings using muscles in the chest. 
Fact 2: To move faster, birds flap their wings more quickly.

Answer:
Bird flap their wings more quickly to fly faster.