Respiration releases:
a. carbon
b. oxygen
c. nitrogen
d. carbon dioxide

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 -

Which group of molecules are targeted by the kinases in order to control this movement

The “ecological footprint” left by a citizen of a developed nation is about four times larger than that left by a citizen of a developing nation. why is this the case?