Is diffusion the only way materials can enter the cell? explain.

Of course not! There's lots of ways materials can enter. It also depends on the cell; whether it has cell wall and cell membrane or only cell membrane.

Besides diffusion, there's also osmosis and active transport.

If the cell has only cell membrane, it means it's partially permeable, which means osmosis can happen.

*hope this helps :)

Apolar solvent will dissolve the sample of calcium chloride