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: coal is used for generating heat by burning. 
Fact 2: Thus, the food is cooked by heat generated internally.

SOLUTION: coal can be used to cook food.

PROBLEM: Fact 1: Cancer is a disease in which cells divide out of control. 
Fact 2: With specific types of gene damage, the cell starts dividing out of control, forming a tumor.

SOLUTION: Cancer and tumors are a result of specific types of gene damage.

PROBLEM: Fact 1: Many consumers feed at more than one trophic level. 
Fact 2: Trophic interactions transfer nutrients from producers to consumers.

SOLUTION:
Many consumer transfer nutrients from more than one producer.