Why don't all plants use the c4 or cam pathways to avoid photorespiration?

Not all plants use the C4 or CAM pathways to avoid photorespiration because they require a lot of extra energy to perform their function. In photosynthesis, minimizing water loss is essential; C4 plants relocate the carbon dioxide to lessen photorespiration while CAM plants indicates when to extract carbon dioxide. Their function is also related to plants survival where C4 plants is usually a summer plant while CAM plants is suited to thrive in desserts. Therefore, only plants that need special requirement to survival use these pathways.

the generally accepted parts of modern cell theory include: all known living things are made up of one or more cells. all living cells arise from pre-existing cells by division. the cell is the fundamental unit of structure and function in all living organisms.