2 What do the arrows on the graph below represent?
-4,000
-3,000
-2,000
1,000
(singular Genus)
Number of Genera
0
500
100
400
300 200
Millions of Years Ago (mya)
A. extinction events
B. meteorite impacts
C. changes in Earth's temperature
D. the evolution of a new species

They are all full and don't need any more electrons in there outer shell.

Hello thereone of the following properties was originally used to arrange elements on the periodic table, but is no longer used to organize the modern version. which property fits this description? answer: atomic mass  was originally used to arrange elements on the periodic table, but is no longer used to organize the modern version.

Answer///an early form of the atomic theory; dalton atomic theory;