d. ended with Au. africanus.
What were the three key observations made by Darwin that allowed him to deduce that
natural selection is a primary driver of evolution?
a. Species change and adapt based on environmental pressure, individuals change
within their lifetime, and offspring inherit the changes.
b. Genetic drift, gene flow, and mutations provide the change necessary in populations
that affect future generations.
c. Organisms produce more offspring than survive, variation exists among members of
populations, and advantageous variations increase in relative frequency over time.
d. The number of adults tends to remain the same over time, individuals vary very little
over time, and natural selection works on only the best of those adults in each
generation.
The masticatory-functional hypothesis states that:
a. over time there was a clear reduction in the size of the face and jaws.
b. tooth and jaw size have decreased over time.
c. change in skull form represents a response to decreased demands on the chewing
muscles.