Which is the best explanation for why you may not always be able to observe rocks transforming from one type to another? a most all rock is transformed beneath the surface of the earth. b the transformation of rock happens slowly over a very long time period in the geologic time scale. c most all rock is transformed by molten magma inside a volcano. d the transformation of rock happens faster than we can observe.

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.

Which of the following particles always has a positive charge? a. electronb. neutron c. proton d. ion

In what part of the body does the most muscle activity happen?