Answer:
first conclusion was that the whole world is made up of only 4 elements but as the time passed more elements were discovered... if the world would not contain more elements... you wouldn't be alive.
Answer:
in the presence of water, a strong acid will dissociate quickly and release heat, so it is an exothermic reaction.
Explanation:
It is simple. A plant structure have different parts but both structures carry around an Cell Wall.
Answer:
A
Explanation:
I looked up aromatic hydrocarbon and this one looks like a replica of benzene