A LOT!
Physical changes give no evidence that a chemical reaction has taken place, because no chemical reaction has taken place.
The martial arts are constantly changing. In the overall picture of things they are minor changes.
shunga ka ?
nothing
at conventions
Because people are trying to save fuel.
what chqnges have taken place in methods of farming and manufacturing in zimbabwe since independence
The answer will depend on what country or city the question is about.
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A fire is an oxidation reaction.
Nucleus