Which of the following pairs are correctly matched?
`{:("Animals","Morphological features"),("(1) Crocodile","4-chambered heart"),("(B) Sea Urchin","Parapodia"),("(C) Obelia","Metagenesis"),("(D) Lemur","Thecodont"):}`

Options

A. Only 1 and 2
B. 1, 3 and 4
C. 2, 3 and 4
D. Only 1 and 4

Answer

To determine which pairs are correctly matched, we will analyze each option provided in the question.

1. **Crocodile - 4-chambered heart**:
- Crocodiles are indeed reptiles that possess a 4-chambered heart. This is a unique feature among reptiles, as most have a 3-chambered heart.
- **Conclusion**: This pair is correctly matched.

2. **Sea Urchin - Parapodia**:
- Sea Urchins belong to the phylum Echinodermata and do not have parapodia. Parapodia are fleshy protrusions found in certain marine organisms, particularly in the class Polychaeta (like earthworms).
- **Conclusion**: This pair is incorrectly matched.

3. **Obelia - Metagenesis**:
- Obelia is a genus of colonial marine organisms that exhibit a life cycle involving metagenesis, which is the alternation of generations between sexual and asexual forms.
- **Conclusion**: This pair is correctly matched.

4. **Lemur - Thecodont**:
- Lemurs are primates, and the term "thecodont" refers to a type of dentition where teeth are set in sockets. This is a characteristic of many mammals, including lemurs.
- **Conclusion**: This pair is correctly matched.

Now, summarizing the results:
- Correctly matched pairs:
- (1) Crocodile - 4-chambered heart
- (C) Obelia - Metagenesis
- (D) Lemur - Thecodont

Thus, the correct answer includes options 1, 3, and 4.

### Final Answer:
The pairs that are correctly matched are:
- (1) Crocodile - 4-chambered heart
- (C) Obelia - Metagenesis
- (D) Lemur - Thecodont