Which materials are named as entering the cell by secondary active transport?

1. Secondary active transport brings sodium ions, and possibly other compounds, into the cell. 2. As sodium builds up outside because of primary active transport, an electrochemical gradient is created and sodium is pulled back through. 3. That movement is used to transport other substances attached to the transport protein, and many amino acids as well as glucose enter this way. 4. Oxygen and carbon dioxide cross by simple diffusion, and whole bacteria are taken in by phagocytosis instead. _Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 5 "Structure and Function of Plasma Membranes", section 5.3 Active Transport_