Which of the following describes how biodiversity contributes to the sustainability of a natural environment?
a. logging allows for the collection of firewood in the mountains of southwest china.
b. non-native alligator weed forms dense mats that crowd native species in california.
c. mining in the guinean forests of west africa provides diamond and gold jewelry for humans.
d. giant kangaroo rats enrich the soil for plants with their piles of grass clippings in the california grasslands.