N = 4 to n = 3 is the right answer, so it' none of the above
Answer:
The number of protons is equal to the mass number of the element. Since an element always has a different number of protons, the mass can indicate how many neutrons are in an isotope. Atoms of the same element can have a different number of neutrons. There are three naturally-occurring isotopes of carbon.
Explanation:
Fishes yes according to the age, reptiles yes
Yes a red blood cell placed in a sline solution shrinks because of the process of osmosis.
