Which of the following choices contains two ways in which carbon dioxide
enters the atmosphere?"
O A erosion and transpiration
O B decomposition and respiration
C volcanic activity and photosynthesis
Dhuman activity and formation of fossil fuels

High blood pressure occurs when there is too much blood flowing through the blood vessels at one time. by changing the amount of water in the blood, blood pressure can change. the excretory system can to lower blood pressure.which would most likely occur in the kidney? a)more water would be transferred from the nephron.b)less water would be absorbed into the nephron.c)the amount of water in the bladder would decrease.d)the amount of water in the blood would increase.

If there is another new infectious disease somewhere in the world, what do you think canadian officials should do

One student group hypothesized that the dry baker's yeast must be alive.the temperature change, odor, and bubble foation, they said, indicated whych characteristic of life