How many pints of blood are in a human body?

Guard cells control which event? the growth of plants capture of solar energy gas exchange in leaves water absorption in roots

The is an estimate of the fewest number of organisms a population needs to avoid extinction. this measurement will most if the number of offspring each female in the population produces increases. if the population's this measurement will most likely increase. 1 population density, minimum viable population, carrying capacity 2 decrease, be unaffected, increase 3 death rate increase, dead rate decrease

This is a biological reaction due to a stimulus. i need this quickly !