About 4,000 new species of marine animals were discovered in the last 2 years. What is the unit rate of discovery?(1 point)
Responses
2 years4,000 species
Start Fraction 2 years over 4,000 species End Fraction
4,000 species2 years
Start Fraction 4,000 species over 2 years End Fraction
1 species2,000 years
Start Fraction 1 species over 2,000 years End Fraction
2,000 speciesyear
Start Fraction 2,000 species over year End Fraction