50 points
the human epithelium contains a layer of cube-shaped cells if the length height and width of such a cell is 1 micrometer what is the surface area of its cell membrane
a) 6 micrometer^2
b) 3 micrometer^2
c) 3 micrometer
d) 6 micrometer^3

Which of the following is not a characteristic of carnosaurs? a. long narrow skulls b. strong forelimbs c. horn projecting from their skulls d. none of the above

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.

Plsss > .< compare and contrast the characteristics of flatworms rounds worms and earthworms