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: condensation is when change from a gas into a liquid by reducing heat energy. 
Fact 2: Heat is kinetic energy.

SOLUTION: condensation is when change from a gas into a liquid by reducing kinetic energy.

PROBLEM: Fact 1: Mammals conserve body heat with their hair or fur. 
Fact 2: Hair and feathers are both made of keratin.

SOLUTION: mammals conserve body heat with keratin.

PROBLEM: Fact 1: Mammals took advantage of the extinction of the dinosaurs. 
Fact 2: All dogs are mammals .

SOLUTION:
dogs took advantage of the extinction of dinosaurs.