Refer to the figure.
The figure shows the temperature (in °C, relative to modern temperature) and the concentrations of carbon dioxide (in ppm) and methane (in ppb) over the past 400,000 years.
- Ten thousand years ago, the concentration of carbon dioxide was about _______ times that of methane.

Question

Refer to the figure.
Refer to the figure. The figure shows the temperature (in °C, relative to modern temperature) and the concentrations of carbon dioxide (in ppm) and methane (in ppb) over the past 400,000 years. - Ten thousand years ago, the concentration of carbon dioxide was about _______ times that of methane. A) 5 B) 20 C) 50 D) 500

Refer to the figure. The figure shows the temperature (in °C, relative to modern temperature) and the concentrations of carbon dioxide (in ppm) and methane (in ppb) over the past 400,000 years. - Ten thousand years ago, the concentration of carbon dioxide was about _______ times that of methane. A) 5 B) 20 C) 50 D) 500

The figure shows the temperature (in °C, relative to modern temperature) and the concentrations of carbon dioxide (in ppm) and methane (in ppb) over the past 400,000 years.
- Ten thousand years ago, the concentration of carbon dioxide was about _______ times that of methane.

Refer to the figure. The figure shows the temperature (in °C, relative to modern temperature) and the concentrations of carbon dioxide (in ppm) and methane (in ppb) over the past 400,000 years.- Ten thousand years ago, the concentration of carbon dioxide was about _______ times that of methane.

Refer to the figure.
The figure shows the temperature (in °C, relative to modern temperature) and the concentrations of carbon dioxide (in ppm) and methane (in ppb) over the past 400,000 years.
- Ten thousand years ago, the concentration of carbon dioxide was about _______ times that of methane.