Characterized by strong, steady winds. ionosphere 2. Used to send radio signals. troposphere 3. Responsible for earth's weather. ozone layer 4. Coldest layer. exosphere 5. Air merges into space. stratosphere 6. Protects earth from UV radiation. mesosphere

The pharynx is the structure in the body that serves as a pathway of both air and food. how does the body make sure that food does not get into the lungs? the salivary glands secrete enzymes that pull food out of the air pathway. the small intestine pushes the air out of the digestive system. the pancreas breaks down food in the air pathway. the epiglottis closes the air pathway so that food will not enter it.

What type of organism is a one-celled organism that functions as a single unit? a. bi-celled b. single-celled c. pre-celled d. multi-celled

Isolated volcanic peaks on the ocean floor are