When cells communicate by the signaling process, one cell produces a signaling molecule that must be received by the signal receptor on or in the responding cell. Signaling molecules are often called ligands, a general term for molecules that bind specifically to other molecules (such as receptors).
Answer:
it's b
Explanation:
Since Orlando is famous for the Disney world theme park. Plus it has Universal.
It would have 76. protons and electrons always have the same amount
Proteins are generally unable to cross the cell membrane
