Convection is the movement of material that distributes heat in the Earth's mantle. What arrangement of material may lead to convective motion? A. Denser material on top of less dense material

B. Less dense material on top of denser material

C. Mixed material with a uniform density

D. Mixed material with a uniform temperature

How does natural selection change thephenotypes within a population over time?

Which of the following is not considered an appendage of the skin? nails glands follicles none of the above

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.