Population may be defined as the smallest unit of ecology and the evolution might occur at the population level.
Population is the group of the organisms that belong to the particular species and lives in a specific particular habitat. The individual of the population breeds among themselves. Sometimes the individual of two different population can also breed among themselves in extreme cases.
Animals have basic sounds that mean basically just "danger" or "come here" where human have more specific phrases like "watch out for that falling branch"
