The response of your body and mind to being challenged or threatened is:

The answer is stress it is the response of your body and mind to being challenged or threatened.  You are experiencing stress when situations, events, or people make demands on your body AND mind. There are four list of types of stressors; major life changes, catastrophes, everyday problems, environmental problems. 

answer: i cant find your answer. do u have another way i can answer it for you : )

explanation:

nucleic acid molecules are incredibly complex, containing the code that guarantees the four different nucleotide units comprise dna, the nucleic acid of interest to the genealogist. and one of four nitrogen-containing molecules called nucleotides