To find the unit rate of discovery of new species of marine animals, you can divide the total number of species discovered by the number of years over which they were discovered.
Given:
- Total species discovered = 3,000
- Total years = 4
Unit rate = Total species / Total years = 3,000 species / 4 years = 750 species per year.
So, the unit rate of discovery is 750 new species of marine animals per year.
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