The bark of the pacific yew tree (taxus brevifolia) was the original source of one of the most effective drugs for treating tumors of the breast, lung, and other sites. taxol, a chemical extracted from this bark, kills actively replicating cells by inhibiting the depolymerization of microtubules. why are microtubules good targets for killing cancerous cells

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.

Consider this plant cell which organelle is labeled g

Which layer will become saturated first when rain falls?