Question

species richness refers to the
○ relative abundance of each species in an area.
○ dominance of one species over others.
○ adaptive traits evolved by a species.
○ number of different kinds of species in an area.

Explanation:

• "Relative abundance of each species in an area" describes species evenness, not richness.
• "Dominance of one species over others" is about species dominance, not richness.
• "Adaptive traits evolved by a species" relates to species adaptation, not richness.
• "Number of different kinds of species in an area" matches the definition of species richness.

Answer:

D. number of different kinds of species in an area.