How we grow ??

This is probably one of the deepest questions that man can ask and one of the greatest mysteries facing him. Scientists have discovered that all living things are made of a material called protoplasm. They can make a chemical formula for protoplasm, and they can take molecules of various elements and compounds and put them together and make materials like protoplasm. However the materials they make are not alike! All living things must be able to grow; they grow to a definite size and shape. A kitten becomes a cat and acorn becomes an oak tree. All living things grow.