B. We are in the cenzoic era so what previously had happen to cause the life we live today was a huge mass extinction.... hope this helps!!
Answer:
Hey, I don't know but try 10+ (h) + 5 ), 79
I think the answer might be B but i’m not positive
An atomic number is <span>the number of protons in the nucleus of an atom, which determines the chemical properties of an element and its place in the periodic table or chart.</span>
Answer:
The coloring and possibly testing it