C. Groups 13-16 contain metalloids.
If you look on a periodic table, these usually have a different color.
the time required for the activity of a substance taken into the body to lose one half its initial effectiveness. Informal. a brief period during which something flourishes before dying out.
hope this helps ^^
I believe that it is a chemical change.
1 result would be the decimation of crops and vegetation, which causes a reduction in farmers income rates which could lead to his workers losing their jobs or even poverty
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