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.

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

Fact 1: hearing is used for sensing sound by animals. 
Fact 2: An ear improves hearing.
Most animals have ears.

Fact 1: Cells secrete acids and bases to maintain the proper pH for enzymes to work. 
Fact 2: Enzymes help to break down proteins so that the bacteria can do their thing better.

cells secrete acids to break down proteins.