Duck-billed platypus is the connecting link between reptiles and mammals. Give reason

Explanation

**Step-by-Step Solution:**

1. **Definition of Duck-billed Platypus**: The duck-billed platypus (Ornithorhynchus anatinus) is a unique mammal native to Australia. It is one of the few extant species of monotremes, which are egg-laying mammals.

2. **Reptilian Characteristics**: The platypus lays eggs, which is a characteristic feature of reptiles. Most mammals give birth to live young, but monotremes like the platypus retain the reptilian trait of egg-laying.

3. **Mammalian Characteristics**: The platypus possesses mammalian features such as fur (hair) and mammary glands. The presence of mammary glands is a defining characteristic of mammals, as these glands produce milk to nourish their young.

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