Why do the cells divide?

Why are the nerve cells long? Why do these cells have projections?

Some cells in the adult animals do not appear to exhibit division (e.g., heart cells) and many other cells divide only occasionally. Such cells are said to be in

Some cells in the adult animals do not appear to exhibit division (e.g., heart cells) and many other cells divide only occasionally. Such cells are said to be in

Why does the zygote divides only after the division of Primary endosperm cells ?

Why do plant cells have an additional layer surrounding the cell membrane? What is this layer known as?