Genes<span> are made of a chemical called </span>DNA<span>, which is short for 'deoxyribonucleic acid'. The </span>DNA<span> molecule is a double helix: that is, two long, thin strands twisted around each other like a spiral staircase. The sides are sugar and phosphate molecules.</span>
I say b and d because they both indicate about the heart
Answer:
C. The population of mice would decrease.
Explanation:
The answers are
1. Matter
2. Biosphere