The bacteria that commonly live in animal and human intestine is

Options

A. Vibrio cholerae
B. Bacillus anthracis
C. Corynebacterium
D. Escherichia coli.

Answer

**Step-by-Step Solution:**

1. **Identify the Question**: The question asks for the type of bacteria that commonly live in the intestines of animals and humans.

2. **Evaluate the Options**: The options provided are:
- A. Vibrio cholerae
- B. Bacillus anthracis
- C. Corynebacterium diphtheriae
- D. Escherichia coli (E. coli)

3. **Analyze Each Option**:
- **Option A: Vibrio cholerae**: This bacterium is known to cause cholera, a waterborne disease, and is not typically found in the intestines of healthy humans or animals. Therefore, this option is incorrect.
- **Option B: Bacillus anthracis**: This bacterium is responsible for anthrax, a serious disease, and is not associated with the intestinal flora of humans or animals. Thus, this option is also incorrect.
- **Option C: Corynebacterium diphtheriae**: This bacterium causes diphtheria, a respiratory disease, and does not inhabit the intestines. Therefore, this option is incorrect as well.
- **Option D: Escherichia coli (E. coli)**: This bacterium is commonly found in the intestines of humans and animals. It plays a vital role in digestion and synthesizes certain vitamins (like B and K) that are beneficial to the host. This makes it the correct answer.

4. **Conclusion**: The correct answer is **Escherichia coli (E. coli)**, as it is the bacterium that commonly lives in the intestines of humans and animals, forming a symbiotic relationship.

**Final Answer**: Escherichia coli (E. coli)

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