Excessive and continous use of pesticides has resulted in evolution of some new species of pests. Explain what must have led to this. What is this type of evolution called ?

Explanation

### Step-by-Step Solution:

1. **Understanding Pesticide Use**: Farmers often use pesticides to control pest populations in crops. However, excessive and continuous use of these chemicals can lead to unintended consequences.

2. **Selection Pressure**: The constant application of pesticides creates a selection pressure on pest populations. This means that pests that are susceptible to the pesticide are more likely to be killed, while those with some level of resistance survive.

3. **Survival of the Fittest**: The pests that survive the pesticide application are typically those that have genetic mutations that confer resistance. These resistant individuals are more likely to reproduce and pass on their resistant traits to the next generation.

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