Which of the scenarios is an example of natural selection? A. As soot from a nearly factory darkens tree trunks, the proportion of black months in a forest population increases
B. A short-tailed lizard is born into a population of long-tailed lizards
C. when a drought drastically reduces the food supply, some members of a deer population move to s new area
D. An arctic fox’s fur gets thicker during an exceptionally cold winter

What evidence is there that convection occurs in earth’s troposphere?

Examine the two squirrel populations in the accompanying figure. the populations are separated by a geographic barrier. if after a long period of time the two species are no longer separated, what evidence is needed to determine if speciation has occurred? the figure shows two populations of squirrels separated by a geographic barrier. examine the two squirrel populations in the accompanying figure. the populations are separated by a geographic barrier. if after a long period of time the two species are no longer separated, what evidence is needed to determine if speciation has occurred? the figure shows two populations of squirrels separated by a geographic barrier. polyploidy is creating new species. the two populations are not interbreeding freely. hybrid offspring of the two populations begin to appear. one species will increase into a population size twice as large as the other species.

Describe how a student should adjust the microscope to see the cells on a slide more clearly?