All of the following statements about communities are correct except?

• A. The distribution of almost all organisms is probably affected to some extent by both abiotic gradients and interactions with other species.
• B. Some animal species distributions within a community are linked to other species.
• C. The trophic structure of a community describes abiotic factors such as rainfall and temperature affecting members of the community.
• D. Ecologists refer to species richness as the number of species within a community.