List any three important characteristics of a population and explain.

Explanation

### Step-by-Step Solution:

1. **Understanding Population**:
- A population is defined as a group of individuals of the same species that live in a specific geographical area for a certain period of time. For example, all the human beings residing in a particular city at a given time form a population.

2. **Characteristic 1: Birth Rate**:
- The birth rate is the ratio of live births in a specific area to the total population of that area. It indicates how many individuals are being added to the population over a certain period. A higher birth rate suggests a growing population, while a lower birth rate may indicate a declining population.

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