When defining concentration during diffusion, what exactly are we
describing?
A. focus of a solvent
B. mass/volume of a solute
C. the mass of a solvent
D. the same equilibrium throughout a system

Imagine ? person stepping on a pin and pulling his or her foot way look at the réfléchir arc of the scenarios below

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.

What causes darkening of the skin as melanin production increases