Question

the cell membrane is selectively permeable, which means... all materials can enter and leave the cell; the cell manually sorts through all materials; only certain cells can interact with the cell; certain things can enter while others cannot

Explanation:

To determine the correct answer, we analyze the concept of selective permeability of the cell membrane. Selective permeability means the membrane allows some substances to pass (enter/exit) and restricts others.

• Option 1 ("All materials can enter and leave") is incorrect as the membrane is not fully permeable.
• Option 2 ("The cell manually sorts through all materials") is incorrect; the membrane's permeability is based on molecular properties, not manual sorting.
• Option 3 ("Only certain cells can interact") is incorrect; it's about substances, not cells interacting.
• Option 4 ("Certain things can enter while others cannot") matches the definition of selective permeability.

Answer:

D. Certain things can enter while others cannot (assuming the green option is labeled D; if labels were A - D with green as D, else adjust label but the text is "Certain things can enter while others cannot").