An ambulance siren sounds different as it approaches you than when it moves away from you. what scientific term would you use to explain how this happens?

Which of the following are true for a hypothesis? a series of observations a collection of facts a first guess a conclusion already reached from observations an initial idea which is assumed to be true

When slavery was abolished?

It grew into the ""island metropolis of Eastern Africa"" as the center of a mercantile empire whose tentacles stretched to the Congo. It later was refashioned by the Portuguese and then became a British colonial capital.

Choose the best answer. Educational opportunities increased when ___ began to train their employees in schools. the Roman Catholic Church guilds dukes and barons manors

Identify a method scientist use to share information with one another

What would have happened if plants like tamarind banyan and mango had fibrous roots

The Trans-Siberian railroad was built to ship valuable natural resources to Russia's growing cities from which region? a. Kazakh Uplands b. Siberia c. Lena River Plateau d. Northern European Plain

Identifty factors in the untied states that made it ideal for the free enterprise system

When the legislative branch creates a law that the Executive branch (president) does not support, what can the president do about it?

What was the major message of the Monroe doctrine