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.

Fact 1: coal is used for generating heat by burning. 
Fact 2: Thus, the food is cooked by heat generated internally.
coal can be used to cook food.

Fact 1: webbed feet are used for moving faster through water by aquatic animals. 
Fact 2: Aquatic animals moving through water are also subject to the principles of aerodynamics.
Aquatic animals in water use webbed feet due to the principals of aerodynamics.

Fact 1: cycles of freezing and thawing water cause ice wedging. 
Fact 2: The processes of weathering, and water or ice wedging may assist in this.

Weathering comes from cycles.