In a paper on photosynthesis in a desert cactus in which selection would you find a review of existing knowledge that is relevant to the experiment

What contributes to the high level of biodiversity found in wetlands? a. the large amount of available organic matter to organisms that are food for larger organisms b. the amount of available water for organism use c. the high nutrient availability d. all of the above select the best answer from the choices provided a b c d