is breathing physical or chemical change ?

Breathing is physical process, respiration is a chemical change.

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 breathing is a chemical change

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Breathing is a chemical process. When air is breathed in, it reacts chemically; when a person breathes out, they release more carbon dioxide than they breathed in, and less oxygen.


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 Breathing is a chemical change,
Fireworks going off is an Chemical change
Boiling water added to instant coffee is a physical change because the chemical makeup is not changing.
A plant making food by photosynthesis is a Chemical change.

The key point about physical and chemical changes is.

A Chemical change is one that is near impossible to change back. It only occurs when a new substance is produced or the original substance disappears. 

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