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: plant reproduction requires pollination. 
Fact 2: Bees are necessary for pollination.
[A]: plant reproduction requires bees.


[Q]: Fact 1: a laser is used for producing light. 
Fact 2: Lasers, for instance, produce coherent light.
[A]: Lasers are used to produce a beam that is coherent.


[Q]: Fact 1: Amphibians are the first true tetrapods, or vertebrates with four limbs. 
Fact 2: Bullfrogs eat other amphibians.
[A]:
Bullfrogs are of the class of creatures that were the first true tetrapods.