Step 1: Understanding population explosion.
Population explosion refers to the rapid increase in the population of an area over a short period. The main causes of population explosion are:
1. **Improved healthcare**: Advances in medicine and healthcare have led to reduced mortality rates, especially infant mortality.
2. **Increased birth rate**: Cultural and social factors encourage higher birth rates, leading to a larger population.
3. **Improved agricultural practices**: Better food production methods have supported larger populations by ensuring food security.
Step 2: Conclusion.
Thus, improved healthcare and increased birth rates are major reasons for population explosion.