Why is a shell considered to be biotic? because it is found in the biosphere because it was alive because it came from something living because it is not living

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