A scientist studies how weathering and erosion can change the shape of a mountain. The scientist needs to collect information over what period of time to gather the most accurate information?
A: years

Rust is a compound with the formula Fe_{2}O_{3}. Which elements combine to form rust?
A: iron and oxygen

The primary function of insulin in our bodies is to
A: regulate the amount of glucose in the blood.

Atoms of which of these elements are part of many organic molecules?
A:
oxygen