Why have biologists stopped using the once-common phrase "light-independent reactions" to describe the Calvin cycle?
a. Calvin cycle enzymes are found in the same cellular location as photosystems I and II.
b. Biologists have discovered that its reactions are triggered directly by light.
c. The Calvin cycle occurs only when stomata are open, which is triggered by light.
d. Although its reactions are not triggered directly by light, they depend on the products of light-capturing reactions.