how might information about past carbo dioxide concentrations on earth contribute to scientists understanding of present carbo dioxide concentrations

Comparing the two carbon dioxide concentrations can help scientists see the change in the atmosphere and predict how the atmosphere will continue to change in the future.

Explanation:Hope it helped!!!

a. possible errors

d. new questions

explanation:

predictions and planning happen before. a summery comes after. errors you get after investigation and new questions propose what you can look for in the future.

complete the square on the right side of the equation;

-5(x + 0)^2 + 15

answer: d. y = -x^2 + 15