Total number of individuals of a species per unti area and per unit time is called

Options

A. population size
B. population density
C. demography
D. population dynamics

Explanation

To solve the question "Total number of individuals of a species per unit area and per unit time is called," we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Question**: The question is asking for a specific term that describes the total number of individuals of a species in a defined area and time frame.

2. **Identify Key Terms**: The key terms in the question are "total number of individuals," "per unit area," and "per unit time."

3. **Review the Options**: The options provided are:
- Population size
- Population density
- Demography
- Population dynamics

4. **Define Each Option**:
- **Population Size**: This refers to the actual number of individuals in a population.
- **Population Density**: This is defined as the number of individuals per unit area or volume at a given time.
- **Demography**: This is the statistical study of populations, including the structure, distribution, and trends in population changes.
- **Population Dynamics**: This involves the mathematical modeling of the size and age composition of populations as dynamic systems.

5. **Analyze the Definitions**:
- The question specifically mentions "per unit area" and "per unit time," which aligns with the definition of population density.

6. **Select the Correct Answer**: Based on the definitions and the context of the question, the correct answer is **Population Density**.

### Final Answer:
The total number of individuals of a species per unit area and per unit time is called **Population Density**.

---