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.

Input: Consider Input: Fact 1: Menopause occurs when menstruation stops occurring, usually in middle adulthood. 
Fact 2: Hot flashes are the classic sign of menopause and peri-menopause.

Output: Hot flashes can occur when menstruation stops occurring.


Input: Consider Input: Fact 1: Phylogeny is the evolutionary history of a group of related organisms. 
Fact 2: Classification can be based on phylogeny.

Output: classification can be based in the evolutionary history of a group of related organisms.


Input: Consider Input: Fact 1: an animal requires energy to move. 
Fact 2: Animals get their energy from food.


Output: An animal requires food to move.