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.
-According to various lines of evidence, our species emerged about 160,000 years ago. At that time, temperatures were about _______°C cooler than they are now, and the carbon dioxide level was about _______ ppm.
A) 4; 200
B) 4; 300
C) 8; 200
D) 8; 300

Question

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. 
-According to various lines of evidence, our species emerged about 160,000 years ago. At that time, temperatures were about _______°C cooler than they are now, and the carbon dioxide level was about _______ ppm.
A) 4; 200 
B) 4; 300 
C) 8; 200 
D) 8; 300

Quizplus · Accepted Answer

Around 160,000 years ago, during the Pleistocene epoch, temperatures were approximately 8°C cooler than today, and atmospheric CO2 levels were about 200 ppm.

Refer to the Figure