Explanation:
i think 'Primer-blast' can
Isotopes are variants of a particular chemical element which differ in neutron number (neutral particle)and all isotopes of a given element have the same number of protons (positive particle) in each atom.So isotope B of the sodium will have 11 protons, 11 electrons but it may have a wide range in its number of neutrons.
A because if you are going down deeper into the ocean, you are going farther away from the sun so it will become colder.