What is meant by the following statement about the cell membrane? the cell membrane is said to be semipermeable.

The cell membrane or a plasma membrane is a semipermeable membrane which means that this is a layer that allows only certain molecules that can pass through it. This allows the cells to keep their materials and the contents parted from the environment and from the other cells. This also makes the phospholipid bilayer an outstanding semipermeable membrane and protects the intracellular organelles from the environment that is outside from the cell.

the electromagnetic energy from the sun arrives in the form of visible and invisible light.