Population size of any species is not a static parameter.

Answer

### Step-by-Step Solution:

1. **Understanding Population Size**:
- Population size refers to the number of individuals of a species present in a specific area at a given time. It is a dynamic parameter that changes over time.

2. **Factors Affecting Population Size**:
- The population size is influenced by various factors, which can be broadly categorized into biotic and abiotic factors.

3. **Biotic Factors**:
- **Natality**: This is the birth rate of individuals in a population. An increase in natality leads to an increase in population size.
- **Mortality**: This refers to the death rate in a population. An increase in mortality leads to a decrease in population size.
- **Predation**: The presence of predators can reduce the population size of prey species.
- **Competition**: Intraspecific (within the same species) and interspecific (between different species) competition for resources can also affect population size.

4. **Abiotic Factors**:
- **Food Availability**: The amount of food available can limit or support population growth. More food typically supports a larger population.
- **Adverse Weather Conditions**: Extreme weather events (like droughts or floods) can negatively impact population size by affecting survival rates.

5. **Conclusion**:
- Given the influence of these factors, it is clear that population size is not static. It fluctuates based on the interplay of natality, mortality, predation, competition, food availability, and environmental conditions.