Since mars is smaller, how can it have an equal landmass?

With smaller mass, object should be more denser in order to have equal landmass.

Mars should be more denser, if it has equal landmass.

But in reality, it's landmass is not equal 'cause it's density is about 72% of that of earth.

Hope this helps!

To use anything transparent

The answer is a) taiga because taigas are cold