Male and female cockroach differ due to presence or absence of:

Options

A. Anal cerci and anal style
B. Anal cerci
C. Anal style
D. Anal setae

Answer

To determine how male and female cockroaches differ, we need to analyze the given options regarding their anatomical features.

### Step-by-Step Solution:

1. **Identify the Options**: The question provides several options that may indicate differences between male and female cockroaches. We need to evaluate each option.

2. **Evaluate Option 1: Anal Saccae and Anal Styles**:
- **Anal Saccae**: These are sensory organs that help detect vibrations. They are present in both male and female cockroaches, so they cannot be used to differentiate between the sexes.
- **Anal Styles**: These are structures found only in male cockroaches. They play a role in reproduction (copulation). Thus, this option indicates a key difference.

3. **Evaluate Option 2: Anal Saccae**:
- As previously mentioned, anal saccae are present in both sexes. Therefore, this option does not represent a difference between male and female cockroaches.

4. **Evaluate Option 3: Anal Styles**:
- This option is correct because anal styles are present only in male cockroaches and are absent in females. This is a definitive characteristic that distinguishes male cockroaches from female ones.

5. **Evaluate Option 4: Anal Setae**:
- Anal setae are bristle-like structures surrounding the anal opening. They are also present in both male and female cockroaches, so this option does not indicate a difference.

6. **Conclusion**: The primary distinguishing feature between male and female cockroaches is the presence of anal styles in males, which are absent in females.

### Final Answer:
Male and female cockroaches differ due to the presence or absence of **anal styles**.

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