Which evidence suggests that more diverse communities are more stable than less diverse communities?
a) Lupines associate with N-fixing bacteria and therefore very successful at colonizing low-nutrient soil.
b) Ulva inhibit invasion of Chondracanthus canaliculatus on rocks in the marine intertidal zone
c) Long-term studies of American grasslands show fields with high numbers of plant species vary less in biomass from year to year
d) Both a and b are correct
e) Both B and C are correct
Answer: C