Answer:E. Down-regulation
Explanation:Cells typically up or down regulate depending on the concentration of a hormone levels. When there is a excessive concentration of a hormone in the blood stream, the cell decreases the number of receptors reducing the interaction with that hormone, Also, when there is excessive hormone reduction, the target cells activate to increase their number of receptors.
Down regulation occurs by the the deactivating or degrading of target cells to reduce the number of receptors due to their sensitivity to a particular excess hormone.
Answer:
Diffusion is an example of passive transport and it requires no energy.
Explanation:
D. Life Cycle.
Think about it this way....
You start out as an infant, you grow older and olde each year and eventually you die. Your souls then goes on into another body and starts the cycle over..
Dew point.
the temperature to which a parcel of air must be cooled to reach it saturation point.
