About 4,000 new species of marine animals were discovered in the last 2 years. What is the unit rate of discovery?(1 point)

Question

Responses

1species/2,000 years
2 years/4,000 species
2,000 species/year
4,000 species/ 2years

Answer 1

To find the unit rate of discovery, we divide the total number of species discovered by the number of years over which they were discovered.

In this case, 4,000 species were discovered over 2 years:

$$\text{Unit rate}=\frac{4,000\text{ species}}{2\text{ years}}=2,000\text{ species/year}$$

So the correct response is:

2,000 species/year