Pick up the correctly matched

Options

A. Water vascular system - Sponge
B. Blubber - Kangaroo
C. Marsupium - Platypus
D. Flame cell - Flatworm

Answer

To solve the question "Pick up the correctly matched," we need to analyze each option provided and determine if the pair is correctly matched based on biological knowledge.

### Step-by-Step Solution:

1. **Analyze Option A: Water vascular system - Porifera**
- The water vascular system is a hydraulic system found in echinoderms (like starfish), not in Porifera (sponges). Porifera have a canal system for water flow.
- **Conclusion**: Incorrect match.

2. **Analyze Option B: Blubber - Kangaroo**
- Blubber is a thick layer of fat found in marine mammals (like whales and seals) for insulation and buoyancy. Kangaroos are marsupials and do not have blubber.
- **Conclusion**: Incorrect match.

3. **Analyze Option C: Marsupial - Platypus**
- The platypus is not a marsupial; it is a monotreme, which is a different class of mammals that lay eggs. Marsupials include animals like kangaroos and koalas.
- **Conclusion**: Incorrect match.

4. **Analyze Option D: Flame cell - Flatworm**
- Flame cells are specialized excretory cells found in flatworms (like planarians). They function similarly to kidneys in excreting waste.
- **Conclusion**: Correct match.

### Final Answer:
The correctly matched option is **D: Flame cell - Flatworm**.