We all begin our developmental journey as a/an

1. Embryo
2. Foetus
3. Zygote
4. None

The answer is 3. Zygote

The correct answer is 3. Zygote.

During the process of human development, after fertilization occurs, the sperm and egg join to form a zygote. The zygote then begins dividing and multiplying to form an embryo, which later develops into a fetus. So, the zygote is the first stage of development after fertilization.