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 scale is used for measuring weight. 
Fact 2: All weights are in grams.

SOLUTION: a scale is used for measuring grams.

PROBLEM: Fact 1: Plants release oxygen during the day but not during the night. 
Fact 2: Oxygen fatigue is a shortage of oxygen reaching the brain.

SOLUTION: Plants can reduce fatigue during the daytime.

PROBLEM: Fact 1: wind and rain cause erosion. 
Fact 2: Alluvial aquifers are the result of erosion.

SOLUTION:
Alluvial aquifers are created by wind and rain.