Final answer:
Abundance refers to the number of individuals in a population. Richness represents the number of species in a community. Evenness measures the distribution of individuals among species. Density is a measure of the number of individuals per unit area in a population.
Step-by-step explanation:
A. Abundance refers to the number of individuals in a population.
B. Richness represents the number of species in a community.
C. Evenness measures the distribution of individuals among species.
D. Density is a measure of the number of individuals per unit area in a population.