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: Sporangia produce spores that develop into tiny, heart-shaped gametophytes. 
Fact 2: Gametophytes are photosynthetic and often heart-shaped.

SOLUTION: sporangia produce spores that develop into tiny photosynthetics.

PROBLEM: Fact 1: if an object is in the sunlight then that object will absorb solar energy. 
Fact 2: An object's color determines how much solar energy it absorbs.

SOLUTION: an objects color determines how much it is affected by sunlight.

PROBLEM: Fact 1: forming coal requires decaying vegetation. 
Fact 2: All microorganisms decompose decayed vegetation or other microorganisms.

SOLUTION:
forming coal requires microorganisms.