Write a correct answer to the given question based on its associated fact. Make sure that your answer is contained in the associated fact. Don't be creative and introduce any new word that is not mentioned in the associated fact! Remember that the associated fact has been rearranged to form the question. So, the correct answer words must lie within the associated fact. The correct answer can be a word, phrase, or even a sentence.

Fact: Animals require alleles for warmth. 
Question: Animals require warmth as encoded on what?
alleles.

Fact: if members of a species cannot mate with females then that species will likely become extinct. 
Question: if members of a species cannot what, then that species will likely become extinct?
mate with females.

Fact: Some psychoactive drugs are  available without restrictions?. 
Question: What type of drug can be purchased with out restrictions?

Psychoactive.