Answer:
B
Explanation:
Chemistry starts with the atom as this is the building block of all chemistry.
The cell, nucleus, and enzyme are all part of biology and not chemistry (at this level at least)
Answer:
A dolphins are mamals because they give live birth.
Explanation:
Nitrogen and hydrogen
N2 +3 H2 ---> 2NH3
hope that answers the question:)
I think its A (hope i helped)
