The number of individuals of the population who left the habitat and gone elsewhere during the time period under consideration is known as :

Options

A. Immigration
B. Emigration
C. migration
D. natality

Answer

To solve the question regarding the number of individuals of a population who left the habitat and gone elsewhere during a specific time period, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Question**: The question asks for the term that describes individuals from a population who have left their habitat to go to another location.

2. **Identify Key Terms**: The key terms in the question are "left the habitat" and "gone elsewhere." This indicates a movement away from the original location.

3. **Consider the Options**:
- **Natality**: This refers to the birth rate of a population, which is not relevant to individuals leaving.
- **Migration**: This involves the movement of individuals from one habitat to another, but it does not specify if they leave permanently or temporarily.
- **Emigration**: This term specifically refers to individuals leaving their habitat permanently to settle elsewhere.
- **Immigration**: This is the opposite of emigration, where individuals move into a new habitat.

4. **Choose the Correct Term**: Based on the definitions:
- Since the question specifies individuals who have left their habitat and gone elsewhere, the correct term is **Emigration**. This indicates a permanent departure from the original habitat.

5. **Final Answer**: The number of individuals of the population who left the habitat and gone elsewhere during the time period under consideration is known as **Emigration**.