The absorption mechanism that requires a specific carrier molecule (but not energy to move digested nutrients across cell membrane is called

The answer is facilitated diffusion.  Facilitated diffusion happens when there is a carried changing the cell membrane so the nutrients can pass through.  During facilitated diffusion, the absorbed nutrients such as water soluble vitamins need a specific carrier to transport the to the cell membrane.

relative humidity, temperature and dew point -- are bound together in the mathematical relationship below. relative humidity changes when temperatures change. because warm air can hold more water vapor than cool air, relative humidity falls when the temperature rises if no moisture is added to the air. so i would say a