Why couldn't life originate on the Moon?
a. too many craters
b. not within a habitable zone in the Solar System
c. lack of atmosphere to keep water on its surface
d. lack of oxygen in its atmosphere
e. too cold a surface
Question 2
What was needed to develop in Earth's atmosphere to protect organisms from the harmful effects of ultraviolet radiation?
a. weather patterns
b. a nitrogenous layer
c. a greenhouse effect
d. an ozone layer
e. reflective clouds