Is the 3 in the molecule a coefficient, subscript, or element? 3h₂o₂

To determine if a particular plant is homozygous or heterozygous, you would have to test cross with a

Nkentucky, intoxicating beverages (beer, whiskey, wine, etc.) are involved to some extent in approximately % of collisions fatal to pedestrians.

What is it called when lava when it erupts from the surface through volcanoes.