Animals included under radiata are

Options

A. Triploblastic
B. Diploblastic
C. Unicellular and colonial
D. All the above.

Answer

**Step-by-Step Solution:**

1. **Understanding Radiata**: The term "radiata" refers to a group of animals in the animal kingdom that are characterized by having two embryonic germ layers.

2. **Identifying Germ Layers**: Animals classified under radiata are diploblastic, meaning they possess two germ layers: ectoderm and endoderm.

3. **Absence of Mesoderm**: In radiate animals, there is no mesoderm present. Instead, they have a non-cellular layer known as mesoglia that fills the space between the ectoderm and endoderm.

4. **Examples of Radiata**: The main groups of animals that fall under the category of radiata include:
- **Porifera** (sponges)
- **Cnidaria** (jellyfish, corals, sea anemones)
- **Ctenophora** (comb jellies)

5. **Conclusion**: Therefore, the animals included under radiata are primarily the diploblastic organisms such as those mentioned above.

**Final Answer**: Animals included under radiata are Porifera, Cnidaria, and Ctenophora.

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