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: Female gametophytes produce eggs inside the ovaries of flowers. 
Fact 2: Fruits develop from the ovary of the flower.

SOLUTION: Female gametophytes produce eggs inside the fruit of flowers.

PROBLEM: Fact 1: Balance is the ability to sense and maintain body position. 
Fact 2: Another name for sense of body position is proprioception.

SOLUTION: Balance involves proprioception ability.

PROBLEM: Fact 1: the movement of an air mass over Earth 's surface causes local weather changes. 
Fact 2: When air masses meet, fronts are formed.

SOLUTION:
fronts cause local weather changes.