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: Food is easier to chew because it is moistened by saliva from the salivary glands. 
Fact 2: Since saliva is made from blood plasma, many chemicals present in blood are also present in saliva.
Food is easier to chew because it is moistened by chemicals made from blood plasma.

Fact 1: Plants use cellulose for their cell walls. 
Fact 2: If the plant is green, it is a producer.
Producers use cellulose for their cell walls.

Fact 1: Echinoderms have a unique water vascular system with tube feet. 
Fact 2: Sea stars use hundreds of tube feet.

Sea stars use a unique water vascular system with feet.