Main cause of population explosion is.......

Explanation

### Step-by-Step Solution:

1. **Understanding Population Explosion**:
- Population explosion refers to a rapid increase in the number of individuals in a given area. It is not just a normal increase; it is characterized by a significant and swift rise in population.

2. **Identifying Causes of Population Explosion**:
- The main causes of population explosion can be attributed to two primary factors:
- **High Birth Rate**: This is when the number of births in a population exceeds the number of deaths. A high birth rate contributes significantly to population growth.
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