Which one of the following kinds of animals are triploblastic

Options

A. Coral
B. Sponge
C. Flatworm
D. Ctenophore

Answer

To determine which kind of animals are triploblastic, we can follow these steps:

### Step 1: Understand the term "triploblastic"
Triploblastic refers to animals that have three germ layers: ectoderm, mesoderm, and endoderm.

### Step 2: Identify the germ layers
- **Ectoderm**: The outermost layer, which forms the skin and nervous system.
- **Mesoderm**: The middle layer, which forms muscles, the circulatory system, and other internal organs.
- **Endoderm**: The innermost layer, which forms the digestive tract and associated organs.

### Step 3: Review the options provided
We need to analyze the options given to identify which animals are triploblastic:
1. **Corals** - Belong to the phylum Cnidaria and are diploblastic (two germ layers).
2. **Sponges** - Also diploblastic and belong to the phylum Porifera.
3. **Flatworms** - Belong to the phylum Platyhelminthes and are triploblastic.
4. **Ctenophores (comb jellies)** - These are also diploblastic.

### Step 4: Conclusion
From the analysis, the only group that is triploblastic among the options is **flatworms** (phylum Platyhelminthes).

### Final Answer
The correct answer is **flatworms**.

---