How do you think the way you do work in biology will be different from the way you worked in chemistry and physics?

Biology is a subject dealing with living organisms whereas the other two subjects are dealing with non living objects.

Biology is the branch of science that deals with the living organisms of the earth. The other subjects like physics and chemistry deals with the non living subjects of the earth. When you are dealing with any non living objects, then you do have the opportunity to correct yourself after you have done a mistake. You have the chance to make a mistake. But in case of living organisms, you mane one mistake, and the organism dies. So we don't have the opportunity to make any mistake here. So much more concentration and much more confidence about the outcome before performing an experiment here.

the answer is b.) hydrogen bonds between bases.