Viability period of human ovum is......

Explanation

**Step-by-Step Solution:**

1. **Understanding Viability**: The term "viability" refers to the period during which the human ovum (egg) remains alive and capable of being fertilized after its release from the ovary.

2. **Ovum Release**: In the human reproductive cycle, an ovum is released from the ovary during ovulation, which typically occurs once a month.

3. **Location of the Ovum**: After being released, the ovum travels to the fallopian tube. This is where fertilization by sperm can occur.

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