List any four characters that are employed in human population census.

Explanation

To answer the question about the four characters employed in human population census, we can follow these steps:

### Step-by-Step Solution:

1. **Natality**: This refers to the birth rate within a population. It is a measure of the number of live births per thousand individuals in a given year. Natality helps in understanding the growth potential of a population.

2. **Mortality**: This is the death rate in a population, indicating the number of deaths per thousand individuals in a given year. Mortality rates are crucial for assessing the health and longevity of a population.

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