Final answer:
Cells develop a normal morphology by receiving and interpreting extracellular positional information, intracellular positional information, and signals from other developing organisms.
Step-by-step explanation:
In order for organisms to develop a normal morphology, cells must receive and interpret extracellular positional information, intracellular positional information, and signals from other developing organisms. This is because cells have developed complex mechanisms of communication that allow them to receive messages, transfer the information across the plasma membrane, and produce changes within the cell in response to the message.