To find the unit rate of discovery of new marine species, you need to divide the total number of new species discovered by the number of years over which they were discovered.
In this case, 4,000 new species were discovered in 2 years. So, you calculate the unit rate as follows:
\[ \text{Unit Rate} = \frac{\text{Total Species Discovered}}{\text{Number of Years}} = \frac{4000 \text{ species}}{2 \text{ years}} = 2000 \text{ species per year} \]
Therefore, the unit rate of discovery is 2,000 new species per year.
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