Menstrual cycle is reported in -

Options

A. Only humans
B. Only apes
C. Only monkey
D. Primates like humans, apes and monkey

Answer

**Step-by-Step Solution:**

1. **Understanding the Menstrual Cycle**: The menstrual cycle is a physiological process that occurs in female mammals, characterized by monthly bleeding. This cycle involves the maturation of an ovum (egg) and the preparation of the uterus for potential fertilization.

2. **Identifying the Organisms**: The question asks where the menstrual cycle is reported. It is important to note that this cycle is primarily observed in mammals, specifically in certain groups of mammals known as primates.

3. **Defining Primates**: Primates include humans, apes, and monkeys. These species exhibit a menstrual cycle, which is a regular and cyclic flow of blood and tissue from the uterus when fertilization does not occur.

4. **Cycle Duration**: In humans, the menstrual cycle typically lasts about 28 days, with the actual bleeding phase lasting approximately 5 to 6 days. This cycle is a crucial part of reproductive health.

5. **Conclusion**: Based on the information gathered, the menstrual cycle is reported in primates, which include humans, apes, and monkeys. Therefore, the correct answer to the question is that the menstrual cycle is observed in these mammals.

**Final Answer**: The menstrual cycle is reported in primates, specifically in humans, apes, and monkeys.

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