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.

[EX Q]: Fact 1: Many corals secrete an exoskeleton that builds up to become a coral reef. 
Fact 2: Coral is calcium carbonate with a trade of carotene.
[EX A]: calcium carbonate becomes a  reef.

[EX Q]: Fact 1: Cells are programmed to divide only a set number of times. 
Fact 2: Cells reproduce asexually, by dividing.
[EX A]: Cells are programmed to reproduce only a set number of times.

[EX Q]: Fact 1: Scales protect fish from predators and parasites and reduce friction with the water. 
Fact 2: Friction causes the decline of speed.
[EX A]:
Scales give fish more speed.