What type of cell division is used to replace old cell?

Mitosis is the cell division used to replace the old cell.

This type of cell division is used when a cell needs to be replicated into exact copies of itself. The new cell (Two in number) is totally duplicate of the original one. The new two cells are called daughter cell while as original one is called mother cell.

it’s lava came from an explosive eruption

all matter is made up of atoms

in any element all atoms are the same

elements in a compound are always in a constant ratio: apex