Oogonia are

Options

A. Constant in number before the birth and added after birth
B. Constant in number and never be added after birth
C. Constant in number before the birth without division
D. Never be constant in number both before and after birth

Answer

### Step-by-Step Solution:

1. **Understanding Oogonia**: Oogonia are the female germ cells that develop into oocytes (egg cells) during the process of oogenesis. They are crucial for the formation of eggs in females.

2. **Formation of Oogonia**: Oogonia are formed during embryonic development, specifically before birth. This means that the number of oogonia is established while the female fetus is still developing in the womb.

3. **Division of Oogonia**: Once formed, oogonia undergo mitotic division to become primary oocytes. This division occurs before birth, and it is important to note that oogonia do not continue to form after birth.

4. **Arrest of Oocytes**: After the formation of primary oocytes, they enter a stage of development where they are arrested at prophase I of meiosis. This arrest lasts until puberty, when the oocytes can resume development.

5. **Constant Number of Oogonia**: After birth, the number of oogonia remains constant. No new oogonia are formed after the female is born; instead, the existing oogonia continue their development into primary oocytes and then secondary oocytes as puberty approaches.

6. **Conclusion**: Based on the information, the correct statement regarding oogonia is that they are constant in number before birth and never added after birth.

### Final Answer:
Oogonia are constant in number before birth and never added after birth.