Answer:
A
Explanation:
It kinda tells you in the question by talking about salt in water.
Answer:
it reacts easily with other substances. This is why they easily rust and oxidize when in contact with oxygen, and tarnish when meets water.
Any cells of the human body, except the cells of a placenta.
I may be wrong but I think it’s the second one. They speed up reactions, and there’s a certain enzyme for a certain reaction.
I believe it would be Mitochondria
