What is the main difference between phagocytosis and pinocytosis?

• A. Pinocytosis involves solid materials, while phagocytosis involves liquid materials.
• B. Phagocytosis involves solid materials, while pinocytosis involves liquid materials.
• C. Phagocytosis uses receptor proteins, while pinocytosis does not.
• D. Both processes involve the release of vesicle contents.

Answer: (B)