Receptors that are bind to chemicals outside of the cell, and this binding process causes a chemical response on the inside of cells

What is the phylum of soft bodied animals with a true bosy cavity and a three part body consisting of a foot visceral mass and a mantle

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 do your cells need to live? a. carbon dioxide b. carbon c. air d. oxygen