Gene flow occurs when individuals move into or out of a population.
Gene flow tends to decrease differentiation.
A decrease in differentiation tends to occur when individuals move in and out of a population.
What tends to occur when individuals move in and out of a population?
Options:
a) By wind and rain
b) permineralization
c) The bending of a ray of light
d) Something with a head, thorax, and abdomen
e) a decrease in differentiation
f) competing for resources
g) barks and snarls
h) metabolic reaction