you must be realy stupid beacuse thats the easyest question in the wold!
Cells divide.
Cells grow in order for the organism to grow and reproduce. Cells only grow to replace other cells that die off and allow for the continued existence of the organism.
Multicellular organisms grow when their cells split off into smaller cells. They make more cells.
They reproduce cells to grow
In multi-cellular organisms as cells grow and divide, they specialize.
Our bodies grow more cells,but more and more cells die.
epithelial cell
Sperm cells can grow back.I had 2 children then had no sperm cells 2 years later another kid
Vegetative Cells...
Cancerous Cells
Yes water can make your brain cells grow, but too much water will make your brain cells burst.
People grow when it is time for the cells to become mature and branch out into larger cells, but it depends on your body.