The united states' most widely grown crop is
a). wheat
b). rice
c). corn
d). sugar

What were the main components of earth’s earliest atmosphere? oxygen and ammonia hydrogen and helium oxygen and nitrogen hydrogen and nitrogen

Why does the earth spin slowly, not faster? is it possible to prove it scientifically? can you prove it with math?

If the dimensions of a cube-shaped cell with a length,height, and width of 1 micrometer were to double, what would be the cell's new ratio of surface area to volume? a.3 to 1 b.4 to 3 c.1 to 2 d1 to 6