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.

are there any answer choices

genetic variation can be caused by mutation (which can create entirely new alleles in a population), random mating, random fertilization, and recombination between homologous chromosomes during meiosis (which reshuffles alleles within an organism's offspring).