Aperson starts to eat a hamburger. as she takes a bite and chews, an enzyme called salivary lipase to begin the process of fat digestion. which of these is the best description of the role of enzymes in digestion?
a. enzymes are acids that physically break down food molecules.
b. enzymes moisten food to teeth in the mechanical process of grinding and chewing.
c. enzymes are proteins that speed up the process of chemically breaking down food molecules.
d. enzymes are cells that secrete saliva and other necessary substances needed for digestion.

Which statements best describe the differences or similarities between a comparative investigation and an experimental investigation? check all that apply. experimental investigations are best for showing cause-and-effect relationships, while comparative investigations do not necessarily show this type of relationship. comparative investigations are often impractical and unrealistic, while experimental investigations are the most practical and realistic kinds of investigations. comparative investigations allow for the use of a wide range of variables but do not have a control group, while experimental investigations involve variables that can be controlled. both experimental investigations and comparative investigations are designed to answer scientific questions. both experimental investigations and comparative investigations focus on making observations rather than collecting new data.

How can an organ, such as the lungs, work for multiple body systems?

Which label identifies the part of the atp molecule that changes when energy is released in the cells of all living things