Answer:
D) Unsaturated fatty acid
<span>the answer is Deoxyribose </span>
Air, water and soil are vital in the lives of all organisms
Answer: Scientists think that early amphibians had lungs becuase they needed efficient oxygen uptake to support their metabolism. Higher rates of metabolism are needed on land, becuase of this scientist think that early amphibians breathed air with lungs.
Explanation: