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: rocks interacting with wind over long periods of time causes weathering. 
Fact 2: Rocks weather at different rates.

A: wind affects rocks.
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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.
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Q: Fact 1: Adult sponges are sessile. 
Fact 2: Most echinoderms are sessile or sedentary marine forms with radial symmetry as adults.

A:
adult sponges are sedentary.
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