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: Mammals can also generate little bursts of heat by shivering. 
Fact 2: All humans are mammals.

SOLUTION: humans can generate little bursts of heat by shivering.

PROBLEM: Fact 1: rocks interacting with wind over long periods of time causes weathering. 
Fact 2: Violent weather can dramatically alter the landscape.

SOLUTION: rocks interacting with wind can dramatically alter the landscape.

PROBLEM: Fact 1: Reproduction is the process by which living things give rise to offspring. 
Fact 2: Whenever it starts to give birth, it gives birth up to two to four babies offspring.

SOLUTION:
Reproduction is the process by which living things give birth to babies.