instruction:
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.
question:
Fact 1: fire converts chemical energy into light and heat energy. 
Fact 2: Fuel is considered a chemical energy.
answer:
Fuel converts into light and heat.


question:
Fact 1: Lions live in social groups called prides. 
Fact 2: Leo's symbol is the lion.
answer:
Leo's symbols live in social groups called prides.


question:
Fact 1: Bottleneck effect occurs when a population suddenly gets much smaller. 
Fact 2: Genetic variation can be reduced by random genetic drift, population bottlenecks, founder effect.
answer:

Genetic variation can be reduced when a population suddenly gets much smaller.