Why is the human brain not considered to be a living organism

The human brain not considered to be a living organism because is doesn't have many qualifications that are need to stay alive. For example it does not repoduce or feed on anything. Unlike humans that are living do.

for example, no new evidence will demonstrate that the earth does not orbit around the sun (heliocentric theory), or that living things are not made of cells (cell theory), that matter is not composed of atoms, or that the surface of the earth is not divided into solid plates that have moved over geological timescales .