【单选题】Researchers conducted breeding studies with two species of mice. Species A was monogamous, while Species B was not.Supporters of the competing parental interest theory hypothesized that the monogamous...
A.
When females from Species A were bred with males from Species B, the resulting offspring were extremely small.
B.
When females from Species A were bred with males from Species B, the resulting offspring were extremely large.
C.
When females from Species B were bred with males from Species A, the resulting offspring were extremely large.
D.
The offspring of Species B mice were consistently smaller than the off-spring of Species A mice.
【单选题】Evolutionary biologists believe that speciation, the formation of a new species, often begins when some kind of physical barrier arises and divides a population of a single species into separate subpo...
A.
The division of a population into subspecies.
B.
The reuniting of separated populations after they have become distinct species.