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: Organisms that live in marine biomes must be adapted to the salt in the water. 
Fact 2: Salinity is a measure of how much salt is in the water.
Organisms that live in marine biomes must be adapted to the salinity.

Fact 1: nectar is used for attracting pollinators by plants. 
Fact 2: Pollinators: Bees, and particularly honey bees, are the primary pollinators.
nectar is used to attract bees to plants.

Fact 1: optical tools are used for observing materials up close. 
Fact 2: Materials Materials Materials are listed alphabetically.

optical tools are used for observing something listed alphabetically up close.