Fact 1: Chromosomes are coiled structures made of DNA and proteins.

Fact 2: DNA is deoxyribonucleic acid.

Given the two facts above, answer the question "chromosomes are coiled structures made of proteins and what?" with the following options: 
- solid, liquid, gas
 - density
 - Something that causes allergies
 - deoxyribonucleic acid
 - It helps them survive
 - inheritance
 - blood cells
 - allow growth


 

    deoxyribonucleic acid     