The cell membrane around a cell forms a barrier that protects and regulates the cell. certain chemicals can pass through the plasma membrane because they have similar chemical properties as the membrane. which best describes those that can pass through? they are concentrated. they are soluble. they are diluted. they are heated.

They are soluble.

Explanation:

They are soluble.

Explanation:

The cell membrane or the plasma membrane is selectively permeable. It allows the passage of certain small polar molecules that are soluble in aqueous medium and  small hydrophobic molecules that have a size and shape that is a perfect fit to pass through the lipid bilayer of the cell membrane. Large molecules are transported across the cell membrane with the help of transport proteins that are embedded on the surface of the cell membrane.

1. a)c-14 has two more protons

2. d)they have different numbers of protons, neutrons, and valence electrons; they are all gases at room temperature.

3. c) iron and nickel.