Which one of the following pairs of animals are similar to each other for the feature stated against them ?

Options

A. Pteropus and Ornithorhyncus - viviparity
B. Garden lizard and crocodile - three chambered heart
C. Ascaris and Ancylostoma - metameric segmentation
D. Sea horse and flying fish- cold blooded (poikilothermal)

Explanation

To determine which pair of animals is similar based on the stated feature, we will analyze each option one by one.

### Step-by-Step Solution:

1. **Option 1: Pteropus and Ornithorhynchus (Viviparity)**
- Pteropus (a genus of flying foxes) is known for viviparity, meaning they give birth to live young.
- Ornithorhynchus (the platypus) is oviparous, meaning it lays eggs.
- **Conclusion:** This pair is not similar in terms of viviparity.

2. **Option 2: Garden Lizard and Crocodile (Three-Chambered Heart)**
- The garden lizard (a reptile) and crocodile (also a reptile) both have a four-chambered heart.
- **Conclusion:** This pair is not similar as they do not have a three-chambered heart.

3. **Option 3: Ascaris and Xlystoma (Metameric Segmentation)**
- Ascaris (a genus of parasitic roundworms) does not exhibit metameric segmentation.
- Xlystoma (a genus of segmented worms) does show metameric segmentation.
- **Conclusion:** This pair is not similar regarding metameric segmentation.

4. **Option 4: Seahorse and Flying Fish (Cold-Blooded)**
- Both seahorses and flying fish are ectothermic (cold-blooded) animals.
- **Conclusion:** This pair is similar as both are cold-blooded.

### Final Answer:
The correct pair of animals that are similar to each other for the stated feature is **Option 4: Seahorse and Flying Fish (Cold-Blooded)**.

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