Organelles, or separate compartments within a cell, are advantageous because ?
a. They seal each compartment completely and keep the organelles from interacting.
b. They eliminate the need for communication with the exterior environment of the cell.
c. They allow eukaryotic cells to be smaller on average and still contain the vital machinery they need.
d. They allow different chemical reactions within the cell to operate simultaneously without interference from the cytoplasm or other reactions happening in different organelles.