Answer:
(a) proton
(b) neutron
(c) electron
particles in nucleus are proton and neutron.
atom is electrically neutral because no.of proton= no.of electron=6
Oceans :unusable
Rivers :usable
Glaciers :usable
Freshwater: usable
Lakes :usable
Groundwater :usable
Answer: I believe it is artificial selection (not certain though)
Explanation: modern day dogs have been bread an domesticated to be used by humans in ways we see fit.
