Which is correct?

Options

A. `99%` of existed species are extinct
B. `65%` of existed species are extinct
C. `40%` of existed species are extinct
D. `30%` of existed species are extinct.

Answer

To determine the correct statement regarding the percentage of extinct species, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Question**: The question asks about the percentage of species that are extinct from those that have existed on Earth.

2. **Analyze the Options**: The options provided are:
- A) 99% of the existed species are extinct.
- B) 65% of the existed species are extinct.
- C) 40% of the existed species are extinct.
- D) 30% of the existed species are extinct.

3. **Research Extinction Rates**: Based on scientific consensus, it is estimated that approximately 99% of all species that have ever existed on Earth are now extinct. This figure is widely accepted in the field of paleontology and evolutionary biology.

4. **Evaluate Each Option**:
- Option A states that 99% of species are extinct, which aligns with scientific findings.
- Options B, C, and D (65%, 40%, and 30%) are significantly lower than the accepted estimate and are therefore incorrect.

5. **Conclusion**: The correct answer is option A: 99% of the existed species are extinct.

### Final Answer:
**The correct statement is: A) 99% of the existed species are extinct.**

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