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 conserve body heat with their hair or fur. 
Fact 2: Hair and feathers are both made of keratin.

Answer: mammals conserve body heat with keratin.


Question: Fact 1: Reproduction is the process by which organisms give rise to offspring. 
Fact 2: Sex equals reproduction.

Answer: sex is the process by which organisms give rise to offspring.


Question: Fact 1: Fungi lack chlorophyll, so they cannot make food by photosynthesis as plants can. 
Fact 2: All plants require sunlight, carbon dioxide, and water for photosynthesis.

Answer:
fungi cannot make food with sunlight.