The cell can use the cell membrane to break down large substances so they can be taken inside the cell.
The cell can use the cell membrane to break down large substances so they can be taken inside the cell.

a The cell can use the cell wall to break down large substances so they can be taken inside the cell.
The cell can use the cell wall to break down large substances so they can be taken inside the cell.

b The cell can surround and take in large substances by extending its cell membrane around them.
c The cell can surround and take in large substances by extending its cell membrane around them.

d The cell can surround and take in large substances by extending its cell wall around them.