Answer:
2
Explanation:
Humans need proteins, fatty acids, vitamins, and minerals
Isotopes are atoms of the same element that have the same number of nucleic protons, but different numbers of nucleic neutrons. This has the effect that they have a different mass number. However they have the same atomic number because that is a measure of how many protons are in the nucleus
Hope this helps!
-Payshence xoxo
