Which types of organisms developed first due to the early environmental conditions on Earth?

A. prokaryotic and aerobic
B. prokaryotic and anaerobic
C. eukaryotic and aerobic
D. eukaryotic and anaerobic

Which of the following examples can cause gene flow between populations? a.an increase in predators to a population of zebra b.a volcanic eruption that kills half of a population of mice c.bird droppings that contain seeds from a different location d.a person that sprays a toxin on a group of mosquitoes

What will happen if two of the base pairs of the stand of the dna are switched

In general, characteristics that an organism survive and reproduce become more common in a population over time. what mechanism of evolution cause this change?