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.

Example Input: Fact 1: All cells share some of the same structures and basic functions. 
Fact 2: Inside the cell is a structure called the nucleus.
Example Output: All nucleus share the same basic functions.

Example Input: Fact 1: Stimuli are detected by sensory nerve cells. 
Fact 2: Sensory nerve centers is where nerve vibration is identified.
Example Output: stimuli are detected by where nerve vibration is identified.

Example Input: Fact 1: gravity causes objects that have mass to be pulled down on a planet. 
Fact 2: Astronomy is the scientific study of the stars, planets and the other celestial bodies.
Example Output:
Gravity pulls down objects that have mass on a celestial body.