Answer:The sun heats earth's atmosphere unevenly. this causes convection currents to move in large circles in the atmosphere.
Explanation:
Optical microscope.
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The brain may send messages directly down nerve cells to the immune system. ... Receptors in muscles provide the brain with information about body position and movement. The brain controls the contraction of skeletal muscle. The nervous system regulates the speed at which food moves through the digestive tract.
