About 4000 new species of Marina animals were discovered in the last two years. What is the unit rate of discovery?

Answer 1

To find the unit rate of discovery of marine animals per year, you would divide the total number of newly discovered species by the number of years over which they were discovered.

If 4,000 new species were discovered over the last 2 years, the calculation would be:

\[ \text{Unit rate} = \frac{\text{Number of species}}{\text{Number of years}} = \frac{4000}{2} = 2000 \text{ species per year} \]

Therefore, the unit rate of discovery is 2,000 marine species per year.