Scientists believe that the *insert answer* explain why Earth’s *insert answer* fluctuated between glacial periods and interglacial periods.

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.

Someone me with this: a mineral' is determined by its actomic structure.

Most of the carbon on earth is stored in the form of