Mathematical expression of the growth of population is called __________.

Explanation

The mathematical expression of the growth of a population is called the **population growth model**.

### Step-by-Step Solution:

1. **Understanding Population Growth**: Population growth refers to the increase in the number of individuals in a population over time. This can be influenced by various factors such as birth rates, death rates, immigration, and emigration.

2. **Growth Curves**: To analyze population growth, scientists often use growth curves. These curves graphically represent how a population changes over time, with time typically plotted on the x-axis and population size on the y-axis.

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