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: the Himalayas were formed by rock folding. 
Fact 2: Movements in the earth's crust have folded and cracked the older rocks.
answer:
the Himalayas were formed from older rock.


question:
Fact 1: Bioterrorism is another potential threat in the environment. 
Fact 2: Bioterrorism is a silent, but very real threat.
answer:
bioterrorism is silent.


question:
Fact 1: Puberty is the period during which humans become sexually mature. 
Fact 2: Before puberty, adolescents experience their highest nutritional demand since infancy.
answer:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
Before beginning sexual maturity, adolescents experience their highest nutritional demand since infancy.


