Final answer:
The feature that is not a feature of a population is the number of species.
Step-by-step explanation:
The feature that is not a feature of a population is C) number of species.
In biology, a population refers to a group of organisms of the same species that live in the same area. The characteristics used to describe and understand populations include population size (the total number of individuals), population density (the number of individuals per unit area), and population distribution (how the individuals are spread throughout their habitat). However, the number of species in a population is not a feature of the population itself, but rather an indicator of the biodiversity within an ecosystem.