Which percent of Earth's atmosphere does carbon dioxide gas make up? (1 point)
• 03
O about 21 percent o
O more than 99 percent
O less than 1 percent
• about 78 percent
less than 1 percent
Carbon dioxide gas makes up less than 1 percent of Earth's atmosphere.
To determine the percentage of Earth's atmosphere that carbon dioxide gas makes up, we need to understand the composition of Earth's atmosphere. Earth's atmosphere is primarily made up of nitrogen (about 78 percent) and oxygen (about 21 percent). The remaining 1 percent consists of various trace gases, including carbon dioxide.
Therefore, the correct answer is "less than 1 percent" since carbon dioxide gas makes up only a very small portion of Earth's atmosphere.