Give the formula for the change in population size .

Explanation

To determine the change in population size, we can use the following formula:

### Step-by-Step Solution:

1. **Understand the Components**:
- The change in population size is influenced by several factors: births, deaths, immigration, and emigration.
- Births (B) increase the population, while deaths (D) decrease it. Immigration (I) adds to the population, while emigration (E) subtracts from it.

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