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: Humans have collected and grown mushrooms for food for thousands of years. 
Fact 2: Foods rich in chlorine are mushrooms, parsley, sweet potato, rhubarb, and especially tomato.
Humans have collected and grown foods rich in chlorine for thousands of years.

Fact 1: looking at bright objects has a negative impact on the eyes. 
Fact 2: Most of the bright objects are stars.
looking at stars negatively impacts the eyes.

Fact 1: cellular respiration is when a cell converts from oxygen and carbohydrates into carbon dioxide, water, and energy. 
Fact 2: Chemically, cellular respiration is the exact opposite of photosynthesis.

the chemical opposite of photosynthesis is when cells convert oxygen and carbs into carbon dioxide, water, and energy.