Orbiting Bodies' Properties Quick Check
4 of 44 of 4 Items
Question
Which percent of Earth’s atmosphere does carbon dioxide gas make up?(1 point)
Responses
more than 99 percent
more than 99 percent
about 21 percent
about 21 percent
less than 1 percent
less than 1 percent
about 78 percent
1 answer
less than 1 percent
1 answer