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: Any antigen that causes an allergy is called an allergen. 
Fact 2: Asthma attacks are caused by allergies.
answer:
Allergens can trigger asthma attacks.


question:
Fact 1: Experiments are often done in a lab. 
Fact 2: Experiments are central to the sciences.
answer:
labs are where science is done.


question:
Fact 1: Specialization occurs when competing species evolve different adaptations. 
Fact 2: Most species are highly specialized for their environments and evolve as the environments change.
answer:

Specialization occurs when competing creatures evolve as the environments change.