Frederick wanted to find out what soil works best for growing roses. He grew them in potting soil, clay, sand and soil he found outside his yard. What is the control in the experiment

The model illustrates a process by which a substance is taken up by a cell. which statements describe the process? a. the model shows the process of endocytosis. b. the process shown in the model requires energy from the cell. c. the cell membrane in the model remains intact throughout the process. d. the model shows the process of facilitated diffusion.