All of the following changes would be likely to decrease the rate of transpiration at 8 A. M. EXCEPT: A-causing the stomata to close
B- Increasing the humidity of the atmosphere
C-Increase the water potential of the atmosphere
D-increasing the water potential of the soil
E-Placing the plant in total darkness

D) Increasing the water potential of the soil. I'm an AP Bio student as well and just took this quiz :)

hydrogen is a compound or a single element and a element is a pure substence that cannot be separated into simpler subtances

clorine is a compound its a chemical substance that forms when two or more different elements combine

so both hydrogen and clorine are compounds