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: a vehicle is used for transportation. 
Fact 2: Cars are vehicles and trucks are vehicles.

SOLUTION: A car is used for transportation.

PROBLEM: Fact 1: Soil can be depleted of nutrients. 
Fact 2: For the nonrenewable resources, depletion means extraction of the available natural resources.

SOLUTION: soil nutrition can be extracted.

PROBLEM: Fact 1: Playing is one way mammals and other animals learn how to behave. 
Fact 2: Playing is really fun.

SOLUTION:
having fun is one way mammals learn to behave.