TASK DEFINITION: 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.
PROBLEM: Fact 1: Some species of reptiles can go several weeks between meals. 
Fact 2: Snakes are legless reptiles.

SOLUTION: some snakes can go several weeks between meals.

PROBLEM: Fact 1: a laser is used for producing light. 
Fact 2: Lasers, for instance, produce coherent light.

SOLUTION: Lasers are used to produce a beam that is coherent.

PROBLEM: Fact 1: boiling is when liquids are heated above their boiling point. 
Fact 2: On the Celsius scale, the freezing point of water is 0 degrees and the boiling point is 100 degrees.

SOLUTION:
Water boils when it's heated above 100 degrees.