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.

[Q]: Fact 1: Viruses cause many human diseases. 
Fact 2: Human viruses are created by natural process.
[A]: Something created by a natural process  cause many human diseases.


[Q]: Fact 1: camouflage is used for protection by prey against predators. 
Fact 2: Camouflage helps disguise an animal so that it is less visable to preditors or prey.
[A]: camouflage is used for protection and helps disguise an animal.


[Q]: Fact 1: Muscles can only contract. 
Fact 2: Muscle size comes from lifting heavy weights.
[A]:
Contracting comes from lifting heavy weights.