The body of _____ is made of two layers of cells.

Options

A. Platyhelminthes
B. Annelida
C. Coelenterate
D. Nematoda

Answer

To solve the question regarding which organism's body is made of two layers of cells, we can follow these steps:

### Step 1: Understand the Question
The question asks which organism has a body made up of two layers of cells. This is typically a characteristic of certain types of organisms in biology.

**Hint:** Think about the basic body plans of different organisms and how they are structured.

### Step 2: Identify the Options
The options provided are:
1. Platyhelminthes
2. Annelida
3. Selenite
4. Nematode

**Hint:** Consider the classification of these organisms and their body structures.

### Step 3: Analyze Each Option
1. **Platyhelminthes (Flatworms)**: These organisms have a more complex body structure with three layers of cells (ectoderm, mesoderm, and endoderm).

**Hint:** Recall that Platyhelminthes are known for having a flat body and are triploblastic.

2. **Annelida (Segmented Worms)**: Annelids also have three layers of cells and a segmented body structure.

**Hint:** Annelids are known for their segmented bodies and also have a triploblastic structure.

3. **Selenite**: This term likely refers to a type of organism known as "Cnidarians," which indeed have two layers of cells - ectoderm and endoderm.

**Hint:** Think about organisms that are simpler and have a two-layered body structure.

4. **Nematode (Roundworms)**: Nematodes are also triploblastic and have three layers of cells.

**Hint:** Nematodes are round and have a more complex body structure.

### Step 4: Determine the Correct Answer
From the analysis, the correct answer is **Selenite (Cnidarians)**, which have a body made of two layers of cells: ectoderm (outer layer) and endoderm (inner layer).

**Hint:** Remember that organisms with two layers of cells are typically simpler and belong to specific groups like Cnidarians.

### Final Answer
The body of **Selenite** is made of two layers of cells.