On which planet life exists ?

Options

A. Venus
B. Uranus
C. Mercury
D. Earth

Explanation

**Step-by-Step Text Solution:**

1. **Identify the Options**: The question asks on which planet life exists, and the options given are Venus, Uranus, Mercury, and Earth.

2. **Evaluate Each Option**:
- **Venus**: While Venus has a similar size to Earth, its atmosphere is extremely thick and hot, making it inhospitable for life as we know it.
- **Uranus**: This planet is a gas giant with extreme cold temperatures and lacks a solid surface, making it unsuitable for life.
- **Mercury**: Mercury is very close to the Sun, resulting in extreme temperatures (very hot during the day and very cold at night), which do not support life.
- **Earth**: Earth has the right conditions for life, including a suitable temperature range, a breathable atmosphere, and abundant water.

3. **Conclusion**: After evaluating all the options, it is clear that Earth is the only planet where life exists.

4. **Final Answer**: Therefore, the correct answer is Earth.