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: Echinoderms use pheromones to communicate with each other. 
Fact 2: Echinoderms are represented by the starfish.
Example Output: Starfish use pheromones to communicate with each other.

Example Input: Fact 1: if a neutral atom loses an electron then an atom with a negative charge will be formed. 
Fact 2: Negative charges are attracted to positive charges.
Example Output: A neutral atom that loses an electron will be attracted to positive charges?.

Example Input: Fact 1: Mutations may change the structure of a chromosome or just change a single nucleotide. 
Fact 2: Nucleotides are the building blocks of DNA .
Example Output:
mutations may change the structure of the building blocks of DNA.