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: Most pituitary hormones control other endocrine glands. 
Fact 2: Chakras are associated with the endocrine glands.

SOLUTION: most pituitary hormones control chakras.

PROBLEM: Fact 1: Mammals generate heat mainly by keeping their metabolic rate high. 
Fact 2: Humans use food to generate body heat.

SOLUTION: food keeps mammals' metabolic rates high.

PROBLEM: Fact 1: changes in the pH of soil can cause plants to die. 
Fact 2: Famines are extreme shortages of food that cause people to die of starvation.

SOLUTION:
Changes in pH of soil can cause extreme shortages of food.