Select the correct answer from the list.(2 points)

Question

Scientists have found that atmospheric carbon dioxide levels have
from 280 parts per million to over
parts per million during the last
years.

Answer 1

Scientists have found that atmospheric carbon dioxide levels have increased from 280 parts per million to over 400 parts per million during the last 100 years.

Answer 2

Select the correct answer from the list.(2 points)
Scientists have found that atmospheric carbon dioxide levels have
increased
from 280 parts per million to over
400
parts per million during the last
50
years.

Answer 3

Scientists have found that atmospheric carbon dioxide levels have increased from 280 parts per million to over 400 parts per million during the last 50 years.