Question

HOW DOES A SINGLE- CELLED FERTILIZED EGG GROW INTO AN ADULT HUMAN BODY..........​

Answer 1

Answer:

Fertilised egg i.e., zygote divides and redivides and forms a ball of cells. This is a kind of embryo and it reaches the uterus and gets attached to the wall of the uterus. ... Thus the zygote forms an embryo, it forms a baby and it forms an adult.

Explanation:

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Answer 2

A life form of any organism starts from a single celled fertilised egg which is knows as a Zygote in a sexual reproduction. In humans, individuals of separate sexes produce gametes (sperm in male & ovum in female) which fuse or fertilised to form a zygote. This process is very specific which allows individuals form a same species to reproduce only.

Zygote has capacity to proliferate and grow into a fully developed baby. Cells of zygote divides very fast and in a asynchronous manner, this phenomenon is called as Cleavage. It just develops a baby within 9 months only which itself shows the speed of its division.
It travels thorough the female fallopian tube towards the uterus where it successfully get bind to the endometrium wall of the uterus, and this is called implantation. It implants in blastocyst stage. Soon the mother tissues start to form placental tissues and embryo makes extra embryonic layers around it and it exchanges material to mother.

Within 9 months it fully developed into a baby.
The cells in the body never stopped to dividing. They divide and replace the dead cells. Helps in increasing the mass of body, regulate the processes of body and etc.