By how much does the pressure of a gas in a rigid vessel decrease when the temperature drops from 0 ∘c to –1∘c?

If the volume of the container doesn't change, then the pressure of
the gas inside is proportional to its absolute temperature.  That's
the temperature on the Kelvin scale.

0°C  =  273.16 K

-1°C =  272.16 K .

So the gas pressure drops to 

                 (272.16 / 273.16)  = 99.63%

of what it was initially, a precipitous plunge of  0.366 percent.

The answer is water molecules are split.cellular respiration and photosynthesis are complement  reactions to each other. these are reverse reactions. in cellular respiration glucose and oxygen yield water and carbon dioxide. so, when respiration begins,  glucose molecules are split. in the opposite reaction - in photosynthesis, carbon dioxide and water yield glucose and oxygen. thus,  when respiration begins, water molecules are split.

Iknow the first part it is the average star i am not 100% sure