<span>The leaf exerts a force on the sidewalk; the sidewalk exerts a force on the leaf.</span>
Answer:
Nucleotides are the subunits of DNA. The four nucleotides are adenine, cytosine, guanine and thymine. Each of the four bases has three components, a phosphate group, a deoxyribose sugar and a nitrogen-containing base.
Answer:
to get the heat of the planet
Explanation: