List any two adaptive features evolved in parasites enabling them to live successfully on their hosts .

Explanation

**Step-by-Step Solution:**

1. **Identify the Question:** The question asks for two adaptive features that parasites have evolved to successfully live on their hosts.

2. **Understanding Parasites:** Parasites are organisms that live on or in a host organism and benefit at the host's expense. They have developed specific adaptations that allow them to thrive in their host environment.

3. **Adaptive Feature 1: Presence of Suckers or Adhesive Organs**
- Many parasites, such as tapeworms and flukes, have evolved specialized structures like suckers or hooks. These structures allow them to attach firmly to the host's tissues, preventing them from being dislodged. This attachment is crucial for their survival as it enables them to feed on the host's nutrients.
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