Answer:
1. 20 different amino acids.
2. Genes
3. nucleotides
4. uracil
Explanation:
1) <span>the solar system and light formed.
2) </span> Earth<span>'s formation, approximately 4,5 billion years ago.
3) </span>the creation of the atmosphere through volcanic out gassing; <span>Earth's primitive atmosphere made a transition to an </span>oxygen<span> rich atmosphere.
4) </span>formation of landmass and oceans.
5) the creation of life; <span> there is evidence of the earliest appearance of eukaryotes.</span>
The answer to this question is C