Carbon dioxide gas makes up less than 1 percent of Earth's atmosphere. So the correct response is "less than 1 percent."
Which percent of Earth’s atmosphere does carbon dioxide gas make up?(1 point)
Responses
about 21 percent
about 21 percent
about 78 percent
about 78 percent
less than 1 percent
less than 1 percent
more than 99 percent
1 answer