It’s due to stem cells. The genes in dna turn on and off to give a cell a specific job, so stem cells can be “programmed” as any cell the body needs. (Muscle cell, skin cell, etc)
Answer:
diffusion is process resulting from random motion of molecules by which there is a net flow of matter from a region of high concentration to a region of low concentration.
Explanation:
A familiar example is the perfume of a flower that quickly permeates the still air of a room. ion diffusion across a semipermeable membrane.
<u>Answer:</u>
The<u> deductive reasoning</u> is an inquiry process that begins with a theory, prediction, or general principle that is then tested through data collection.
<u>Explanation:</u>
Deductive reasoning or logic is the reasoning mechanism from one or more statements in order to draw a logically definite inference. Deductive reasoning moves in the same direction as conditional reasoning and connects assumptions to judgments.
Both inductive and deductive reasoning aspire to build a reasonable argument. Inductive reasoning thus jumps from specific instances to a generalized conclusion, while deductive reasoning steps from generalized concepts, which are regarded to be accurate to a real and specific assertion.

They are further classified into: fish, amphibians, birds, reptiles and mammals.
I hope I've helped : )