Give two important features of acquired immunity.

Explanation

**Step-by-Step Text Solution:**

1. **Definition of Acquired Immunity**: Acquired immunity is a type of immunity that develops after birth in response to exposure to pathogens or through vaccination. It is not present at birth but is developed over time as the immune system encounters various antigens.

2. **Feature 1 - Specificity**: One important feature of acquired immunity is its specificity. This means that acquired immunity is tailored to recognize and respond to specific pathogens. When a pathogen enters the body, the immune system generates antibodies that are specifically designed to target that particular pathogen.

3. **Feature 2 - Memory**: Another key feature of acquired immunity is its ability to create immunological memory. After the initial exposure to a pathogen, the immune system retains a "memory" of that pathogen. This allows for a faster and more effective immune response if the same pathogen is encountered again in the future.

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