Question

If even the bones are made of cells and all other parts of an

Living organism are also made up of cells then why do we always find the bones of pre-hestoric animals why we cannot find there rest body after all both of them are made up of cells then why does one type of cell remains for such a long time and the other one gets disappeared what's the reason?

Answer 1

Bones have cells. They are called osteocytes.

But, bones contain much more than just cells.

Our muscles, skin etc contain just cells. So, when we die, the cells will die, and micro-organisms decompose our muscles and skin.

But, our bones conatin cells, calcium and a protein called collagen.

Collagen is a very strong protein. These collagen fibres and cells are dipped in calcium, which makes our bones.

So, when we die, our bones will not be decomposed easily. This is because, calcium is a mineral (metal) and micro-organisms cannot decompose them. The bone cells and protein are inside calcium too.

So, due to strength of calcium seen in bones, our bones can last long for millennia. That is why we find bones as fossils.