Succession is a thing that happens to forests or other ecosystem landscapes.
Answer:
1. Purines
2. States that DNA composition varies among species
3. Hydrogen Bond
4. Purines
<em>Answer to #2 is a little iffy </em>-- sorry
Explanation:
Pyrmidines have two rings
Purines have one ring
Complementary bases are connected by hydrogen bonds.
There are 4 factors for evolution: mutation, gene flow, genetic drift, and natural selection. Natural selection is the strongest
No because that would not be your urine