In which of the following ways are Venus and Mars alike,yet markedly different from Earth?
A) Their surface temperatures are both much higher than that of Earth.
B) They are both perpetually shrouded in clouds.
C) They both have either active or extinct volcanoes on their surfaces.
D) Their atmospheres are made up primarily of carbon dioxide.

Question

Quizplus · Accepted Answer

Both Venus and Mars have atmospheres primarily made up of carbon dioxide, which is very different from Earth's predominantly nitrogen and oxygen atmosphere. While the other options are also true of Venus and Mars, they do not distinguish them from Earth as distinctly as their unique atmospheric composition.

In Which of the Following Ways Are Venus and Mars