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: the mass of an object causes the gravitational force exerted by that object. 
Fact 2: Gravity accelerates mass.

SOLUTION: gravitational force accelerates objects.

PROBLEM: Fact 1: recycling reduces the resources needed to make something. 
Fact 2: Recyclability and recycling of materials is essential.

SOLUTION: It is essential to reduce resources needed to make things.

PROBLEM: Fact 1: Ribosomes are structures in the cytoplasm where proteins are made. 
Fact 2: Rough endoplasmic reticulum has ribosomes attached d.

SOLUTION:
structures where proteins are made are located on rough endoplasmic reticulum.