instruction:
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.
question:
Fact 1: All cells share some of the same structures and basic functions. 
Fact 2: Inside the cell is a structure called the nucleus.
answer:
All nucleus share the same basic functions.


question:
Fact 1: Light enters the eye through an opening called the pupil. 
Fact 2: Light is essential to vision.
answer:
vision requires the pupil.


question:
Fact 1: Cells secrete acids and bases to maintain the proper pH for enzymes to work. 
Fact 2: Malic acid is produced in guard cells.
answer:

malic acid maintains the proper pH for enzymes to work.