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: Temperature falls from lower to higher altitudes. 
Fact 2: Temperatures vary with altitude and season.
temperatures vary depending on season.

Fact 1: when an electrical circuit is working properly , electrical current runs through that circuit. 
Fact 2: Electrical circuits require a complete loop through which the electrical current can pass.
Electricity completes a loop in a circuit to work properly.

Fact 1: Endospores are commonly found in soil and water. 
Fact 2: Exospores and endospores are produced by some members of the cyanobacteria.

cyanobacteria are commonly found in soil and water.