Question

indentify the kind of growth (irreversible and internal or reversible and external) that takes place in each of the following things:
body cells, hair, mountain, rivers, nails, clouds, glaciers, theeth. ​

Answer 1

Answer:

Both, nails and hair, are made of keratin, which is a protein made of dead cells.

So, technically, they are dead.

On the other hand, the base of the nails (nailbed) and the hair roots are made up of living cells, which is the reason for their growth.

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Answer 2

Answer:

body cell,hair mountain,nails,clouds, glacier,teeth

Explanation: