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: Producers are organisms that produce food for themselves and other organisms. 
Fact 2: Humans can produce.
humans can provide food for other organisms.

Fact 1: Cells cannot survive without oxygen. 
Fact 2: Life is responsible for oxygen in the atmosphere.
cells cannot survive without the atmosphere.

Fact 1: ice wedging is when ice causes rocks to crack by expanding in openings. 
Fact 2: Water in the cracks of rocks freeze and expand.

Ice wedging is when Water freezes and expands.