In the lab, Gregory is using a substance that has the same composition throughout. Hele separates the substance into a liquid and solid using a physical process. Based on this description, Gregory's substance is a(n)
A
element
B
compound
heterogeneous mixture
D
solution

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.

How are proteins and nucleic acids related? they both provide energy. they both carry genetic information. the structure of proteins is determined by nucleic acids. the subunits of nucleic acids are also the subunits of proteins.

Do plant cells perform cellular respiration?