Question

the double strands of are held together by hydrogen bonds between the nitrogenous bases.

Explanation:

In biology (a subfield of Natural Science), DNA (deoxyribonucleic acid) has a double - helix structure where its two strands are held together by hydrogen bonds between complementary nitrogenous bases (adenine - thymine and guanine - cytosine). This is a fundamental concept in molecular biology related to the structure of DNA.

Answer:

DNA (deoxyribonucleic acid)