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 looseness of soil has a positive impact on a plant 's roots' growth in that soil. 
Fact 2: Baby plants grow faster if separated with a large amount of roots.

SOLUTION: the looseness of soil has positive impact on baby plants.

PROBLEM: Fact 1: gravity pulls objects towards planets. 
Fact 2: Earth is our planet.

SOLUTION: gravity pulls objects towards earth.

PROBLEM: Fact 1: a light bulb is used for seeing in the dark. 
Fact 2: Conventional light bulbs generate light by heating a filament.

SOLUTION:
Heating a filament is helpful for seeing in the dark.