If New organisms have been INTRODUCED TO THe ecosystem THAT
eat insects and PlaNTS in grassland , would it decrease increase , or stay the same .

the number of plants and insects will be decreased

hope it helps you

A. 38%

Explanation:

Percentage increase in carbon dioxide concentration = (Increase in concentration of carbon dioxide/initial concentration)×100

P = (C₂-C₁/C₁)×100 Equation 1

Where P = percentage increase in the concentration of carbon dioxide from 1970 to 2007, C₁ = The atmospheric concentration of carbon dioxide in 1970, C₂ = The atmospheric concentration of carbon dioxide in 2007.

Given: C₁ = 278 ppm, C₂ = 383 ppm.

Substituting these values into equation 1

P = [(383-278)/278]×100

P = (105/278)×100

P = 37.7%

P ≈ 38%

Thus the approximate percentage increase in carbon dioxide concentration from 1790 to 2007 is 38%

The right option is A. 38%