Respuesta :

PHDFlopper
The answer for the first question is C
Without the gases that keep the earth warm, the average temperature of the earth will decrease.
The answer for the second question is B
wungo
For the first one its A "Be able to sustain life" Because if without the "Greenhouse effect" the earth would be too cold for humanity to live.

For the 2nd is its B. Since it's the increase of births