Procholorococcus produce % of the Earth's oxygen and only have -- genes.
A: 5; 1700
B: 10; 600
C; 5; 600
D: 10, 1700

Prochlorococcus microbes are among the major primary producers in the ocean, responsible for a large percentage of the photosynthetic production of oxygen. Analysis of the genome sequences of 12 Prochlorococcus strains show that 1,100 genes are common to all strains, and the average genome size is about 2,000 genes.

Explanation:

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good lesson

substitution is the answer in this case