Astronomers want to study a star in the Andromeda galaxy, the closest galaxy to our own. Which instrument has the advanced technology needed to study such a far-off object?

rover
telescope
satellite
orbiter

Before tuberculosis was understood to be a communicable disease, and before the discovery of antibiotics to treat it, a major outbreak could kill or cripple a significant portion of a nation’s labor force. how would such an event affect the economy? illustrate the effect by dragging to shift either the aggregate demand curve or the long-run aggregate supply curve.

Which factor contributed to the rise of african empires such as ghana and mali?

Why is it difficult to determine which countries belong to europe and which belong to southwest asia