When the rate of diffusion begins to slow down, the concentration gradient is less steep indicating that the particles are nearing the point of equilibrium.

In many humans, exposing the skin to sunlight over prolonged periods of time results in the production of more pigment by the skin cells (tanning). this change in skin color provides evidence that -

What is a photon? a. part of a ribosome b. a light particle c. a carbon dioxide molecule d. part of a chloroplast b.a light particle

Which describes the habitat of a frog?