Identify the correct sequence of processes that happen in an adult female leading to child birth.

Options

A. fertilisation `rarr` implantation `rarr` development of foetus `rarr` ovulation `rarr` birth
B. ovulation `rarr` fertilisation `rarr` implantation `rarr` development of foetus `rarr` birth
C. implantation `rarr` ovulation `rarr` development of foetus `rarr` fertilisation `rarr` birth
D. menstruation `rarr` fertilisation `rarr` ovulation `rarr` development of foetus `rarr` birth

Answer

To identify the correct sequence of processes that occur in an adult female leading to childbirth, we can break it down into the following steps:

### Step-by-Step Solution:

1. **Ovulation**: The first step in the process is ovulation, which is the release of a mature egg (ovum) from the ovary. This is crucial as it provides the female gamete necessary for fertilization.

2. **Fertilization**: After ovulation, if sexual intercourse occurs, the sperm from the male can meet the egg. Fertilization is the process where the male gamete (sperm) fuses with the female gamete (egg) to form a zygote.

3. **Implantation**: Once fertilization occurs, the zygote begins to divide and develop as it travels down the fallopian tube towards the uterus. After several days, it reaches the uterus and implants itself into the uterine lining. This process is known as implantation.

4. **Development of the Fetus**: After successful implantation, the zygote develops into an embryo and eventually into a fetus over a gestation period (approximately 9 months in humans). During this time, the fetus grows and develops all necessary organs and systems.

5. **Childbirth**: Finally, after the gestation period is complete, the process of childbirth occurs, which involves labor and delivery of the baby.

### Correct Sequence:
- Ovulation → Fertilization → Implantation → Development of Fetus → Childbirth