Why do Agracultural and natural resource systems vary from state to state.

Which ofbthe following is a characteristic shared by both brazil and mexico

Why is the huronian supergroup rock formation particularly interesting to scientists? because it looks like a cross-section of a giant, stone encyclopedia because it formed during the period when oxygen began to accumulate in the atmosphere because it contains unusually large amounts of oxygen and sulfur because it dramatically altered the planet's development when it first formed

In what three areas is the us leader?