Answer: Metaplasia
Explanation: The process of substituting cells in the trachea with cells that can survive the harsh effect from smoking. This process is called Metaplasia.
Metaplasia is a form of Cellular adaptation process, which initiate response to different types of stimuli and adverse changes in the environment.
Metaplasia involves changing epithelial cells (which lines all the body parts) to another cells that can resist the adverse effects from the extrinsic environment.
Answer:global warming, acid rain, air pollution, urban sprawl, waste disposal, ozone layer depletion, water pollution, climate change and many more
They affect every human, animal and nation on this planet.
Answer:
The mouth, esophagus, stomach, small intestine, large intestine, and anus.