What happened when there was a dramatic decrease in the amount of CO2 in early Earth’s atmosphere?

THE WINGS OF A BAT AND THOSE OF A FLY REPRESENT

MIGRATORY PATTERNS OVER HUMAN HISTORY HAVE ALTERED THE COURSE OF HUMAN EVOLUTION PRIMARILY AS A RESULT OF

WHICH OF THE FOLLOWING IS FALSE ABOUT NATURAL SELECTION?

WHICH OF THE FOLLOWING IS FALSE?

THE BIOLOGICAL CONCEPT OF SPECIES

NATURAL SELECTION IS NOT POSSIBLE UNLESS

DARWIN PROPOSED THAT NEW SPECIES ARE THE RESULT OF MODIFICATIONS FROM ANCESTRAL FORMS BY

Uplift and formation of a mountain range divide a freshwater snail species into two isolated populations. Erosion eventually lowers the mountain range and brings the two populations together again, but when they mate, the resulting hybrids all produce sterile young. This scenario is an example of     

THE MAJOR MECHANISM FOR CREATING GENETIC DIVERSITY IN EARTH’S EARLY PROKARYOTES WAS