Plants and other autotrophs can not rely on photosynthesis alone for energy.
True or false

Explain two reasons you think it is important for scientists to search for new ways to treat cancer

What is the most appropriate method of gaining weight (muscle mass)

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 -