Answer: Proteins
Proteins in the Membrane
Active transport usually happens across the cell membrane. There are thousands of proteins embedded in the cell's lipid bilayer. Those proteins do much of the work in active transport.
C. calcium is your answer
Mimicry is a structural adaptation that enables 1 species to look like another
Explanation:
This enzyme helps to digest lactose, a sugar found in milk and other dairy products. Lactase is produced by cells that line the walls of the small intestine.