Answer:
Because scientists call vaccines reagents.
Below are the answers:
1.b - cfcs
2.d - <span>carbon dioxide,smog,acid rain. </span>
3.a - <span> laws and treaties that limit or ban pollutants</span>
4.c - <span>burning leaves and brush
</span>
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Answer:
D
75 neutrons and 50 protons and 50 electrons
Explanation:
Atomic number represents the number of protons and it's the same number for electrons
50 protons and 50 electrons
the mass number represents the number of neutrons and protons
125-50=75 neutrons
it would be heating of 32g of s and 56g of Fe to produce 88g of FeS and unused reactants