Give short answers : How does the immune system work against the microbes?

Explanation

### Step-by-Step Solution:

1. **Definition of Immunity**:
- Immunity is the body's ability to fight against disease-causing organisms (microbes) such as viruses, bacteria, and protozoa.

2. **Activation of the Immune System**:
- When a microbe (antigen) enters the body, the immune system gets activated in response to the infection.

...