For evolution,the most important requirement is `:`

Options

A. adaptation of acquired characters
B. Variation
C. natural selection
D. development anomaly

Answer

**Step-by-Step Solution:**

1. **Understanding Evolution**: Evolution refers to the gradual changes that occur in living organisms over time. These changes can be observed in the genetic material (DNA) of the organisms.

2. **Identifying Requirements for Evolution**: For evolution to occur, certain conditions must be met. The key requirements include variation in genetic material, natural selection, and adaptation.

3. **Analyzing the Options**:
- **Option A: Adaptation of acquired characters**: This refers to traits that organisms acquire during their lifetime. However, these traits are not passed on genetically, so this option is not the primary requirement for evolution.
- **Option B: Variation**: This is the presence of differences in the genetic makeup of individuals within a population. Variation is essential for evolution as it provides the raw material for natural selection.
- **Option C: Natural selection**: While natural selection is a mechanism of evolution, it requires variation to act upon. Therefore, it cannot be the most important requirement on its own.
- **Option D: Development anomaly**: This refers to irregularities in development, which can occur but are not a fundamental requirement for evolution.

4. **Conclusion**: The most important requirement for evolution is variation. It is the genetic differences among individuals that allow for natural selection to occur, leading to evolutionary changes.

**Final Answer**: The most important requirement for evolution is **Variation**.

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