Answer:
this question doesn't make any sense. where are the different parts that we're trying to match up?
Weathering describes the breaking down or dissolving of rocks and minerals on the surface of the Earth.
The mass number is the sum of the number of protons and number of neutrons the atom has.
So, we can write the equation as:
x + 20 = 40
x = 20 neutrons.
Answer:
D.
Explanation:
The immune system lowers the chances of bacteria, viruses, and diseases entering your body
