Why were certain foods rationed during world war ii?

The correct answer is: "There is a situation or shortage or of excess demand".

Rationing is an allocation system that is adopted in an economy when the amount produced cannot serve the whole demand and there is no price adjustment. This was the case during WWII.  A possible rationing strategy could be "first come, first serve", for example or dividing the total output between the population and allocating a fixed ration for each person.

name two ways organisms join a population and two ways organisms leave a population. two ways organisms join a population are birth rate and immigration. two ways they leave are death rate and emigration.

explanation:

c, to compete