Which statement about sound is true?

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Water is heated in a kettlE. The inside water is heated by convection. A person sitting near the fire receives heat by ________?

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The main constituent of hemoglobin is___________?

A. Chlorine B. Iron C. Calcium D. None of these...

Most of the ozone in the atmosphere is concentrated in the _____________?

A. Mesosphere B. Troposphere C. Stratosphere D. ionosphere...

The Sun is at an average distance of about________ million kilometers away from Earth?

A. 100 million B. 150 million C. 200 million D. 250 million...

All of the following foods contain carbohydrates except.

A. Rice B. Meat C. Potato D. Milk...