Which of the following sponge characteristic is not typical of animals ?

Options

A. They practice sexual reproduction
B. They have the cellular level of organization
C. They are asymmetrical
D. Both (b) and (c)

Answer

To determine which sponge characteristic is not typical of animals, we need to analyze the given options one by one:

1. **Understanding the Characteristics of Sponges:**
- Sponges belong to the phylum Porifera and are known for their unique features. They are primarily aquatic and have a porous body structure with various types of pores.

2. **Analyzing the Options:**
- **Option A: They practice sexual reproduction.**
- This is a characteristic found in many animals, including sponges. Therefore, this option is typical of animals.

- **Option B: They have a cellular level of organization.**
- Sponges are unique in that they possess only a cellular level of organization, lacking true tissues. This characteristic is not found in higher animals, which typically have tissue and organ levels of organization. Thus, this option is not typical of most animals.

- **Option C: They are asymmetrical.**
- Most sponges are asymmetrical, meaning they do not have a defined shape that can be divided into equal parts. While some animals exhibit radial or bilateral symmetry, sponges are primarily asymmetrical. Therefore, this characteristic is also not typical of most animals.

3. **Conclusion:**
- Since both options B and C describe characteristics that are not typical of other animals, the correct answer is **Option D: Both B and C.**

### Step-by-Step Solution:
1. Identify the characteristics of sponges.
2. Analyze each option to determine if it is typical of animals.
3. Conclude that options B and C are not typical of higher animals.
4. Select the correct answer as Option D.