Which one of the following animals are triploblastic?

Options

A. Corals
B. Flat worms
C. Sponges
D. Ctenophores

Answer

To determine which of the following animals are triploblastic, we need to understand what triploblastic means. Triploblastic animals have three embryonic germ layers: ectoderm, mesoderm, and endoderm. Let's analyze the options provided:

1. **Corals**: Corals are part of the phylum Cnidaria and are diploblastic, meaning they have only two germ layers: ectoderm and endoderm. Therefore, this option is incorrect.

2. **Flatworms**: Flatworms belong to the phylum Platyhelminthes and are indeed triploblastic. They possess all three germ layers: ectoderm, mesoderm, and endoderm. This option is correct.

3. **Sponges**: Sponges are part of the phylum Porifera and are also diploblastic. They do not have true tissues and only have two germ layers. Therefore, this option is incorrect.

4. **Tinofoam**: Tinofoam (or Ctenophora) are also diploblastic, having only ectoderm and endoderm. Thus, this option is incorrect as well.

After analyzing all the options, the only triploblastic animal listed is **Flatworms**.

**Final Answer**: The correct answer is **Flatworms** (Option 2).

---