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: plant requires seed dispersal for reproduction. 
Fact 2: Many plants depend on birds for pollination and seed dispersal.

SOLUTION: plants are pollinated by birds.

PROBLEM: Fact 1: Mammalian teeth are important for digestion. 
Fact 2: For instance, bacteria in the digestive tract helps glean the most nutrients from food.

SOLUTION: Mammalian teeth are important for gleaning nutrients from food.

PROBLEM: Fact 1: if an object reflects light toward the eye then that object can be seen. 
Fact 2: Mirrors reflect light.

SOLUTION:
mirrors reflect objects towards the eye.