Which is correctly matched .

Options

A. Sea Anemone- Triploblastic - Cnidaria
B. Silver Fish - Pectoral and pelvic fins - Chordata
C. Duck-billed Platypus - Oviparous - Mammalia
D. Milipede- Ventral nerve cord - Arachinida.

Answer

To determine which option is correctly matched, we will analyze each option provided in the question step by step.

### Step-by-Step Solution:

1. **C anemon, triploblastic, cnidaria**:
- C anemon (likely referring to sea anemone) belongs to the phylum Cnidaria.
- Cnidarians are known to be diploblastic, meaning they have two germ layers (ectoderm and endoderm) and lack a mesoderm.
- Therefore, this option is **incorrect**.

2. **Silverfish, pectoral and pelvic fins**:
- Silverfish are insects and belong to the class Insecta.
- They do not possess pectoral and pelvic fins, which are features found in fish.
- Hence, this option is also **incorrect**.

3. **Duck-billed platypus, oviparous, mammalia**:
- The duck-billed platypus is a unique mammal that lays eggs, classifying it as oviparous.
- It belongs to the class Mammalia, specifically to the group of monotremes, which are egg-laying mammals.
- This option is **correct**.

4. **Millipede, ventral nerve cord, arcanida**:
- Millipedes belong to the class Diplopoda and not to the subphylum Chelicerata (which includes Arachnida).
- Millipedes do not have a ventral nerve cord; instead, they have a nerve cord that runs along their back.
- Therefore, this option is **incorrect**.

### Conclusion:
The only correctly matched option is **Duck-billed platypus, oviparous, mammalia**.

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