Cellular slime molds are single-celled amoebid protists. What unique feature makes it an ideal subject for studying multicellular organism generation?

• A. The individual cells can combine together to form one gigantic cell.
• B. The individual cells dissipate upon contact with water.
• C. The cell can survive extremely low pH.
• D. The cell can aggregate into a great swarm when a chemical signal is detected.

Answer: (D)