Bacteria found in hot acidic aerobic aonditions are

Options

A. Halophiles
B. Thermoacidophiles
C. Methanogens
D. Rickettsiae.

Answer

To solve the question "Bacteria found in hot acidic aerobic conditions are," we will analyze the options provided and determine which one fits the description.

### Step-by-Step Solution:

1. **Understand the Question**: The question is asking for a type of bacteria that can thrive in hot, acidic, and aerobic (oxygen-present) conditions.

2. **Evaluate the Options**:
- **Halophiles**: These are organisms that thrive in high salt concentrations. They do not specifically thrive in hot or acidic conditions, so this option is incorrect.

- **Thermoacidophiles**: The name itself gives a clue. "Thermo" refers to heat (high temperature) and "acidophiles" refers to organisms that thrive in acidic environments. Therefore, thermoacidophiles are indeed bacteria that can survive in hot and acidic conditions. This option is likely the correct answer.

- **Methanogens**: These bacteria produce methane gas and typically thrive in anaerobic (absence of oxygen) conditions, often in environments like swamps or the intestines of animals. They do not fit the criteria of being aerobic, so this option is incorrect.

- **Rickettsia**: These are gram-negative bacteria that are obligate intracellular parasites, often found in lice and mites. They do not thrive in hot, acidic conditions, making this option incorrect as well.

3. **Conclusion**: After evaluating all the options, the only type of bacteria that fits the description of thriving in hot, acidic, and aerobic conditions is **thermoacidophiles**.

### Final Answer:
The correct answer is **thermoacidophiles**.