While living in and on the host species, the animal parasite has evolved certain adaptations. Describe these adaptations with examples.

Explanation

### Step-by-Step Solution:

1. **Definition of Animal Parasites**:
- Animal parasites are organisms that live on or inside a host organism and derive their nutritional requirements from the host. This relationship is typically harmful to the host.

2. **Adaptation 1: Loss of Unnecessary Sense Organs**:
- Many parasites have evolved to lose certain sense organs that are not necessary for their survival in a host environment. For example, lice and fleas have lost their wings, which are unnecessary since they do not need to fly but rather cling to their host.

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