What is the key difference between phagocytosis and pinocytosis?
a. with phagocytosis, the engulfed substances are in particles; with pinocytosis the engulfed substances are in solution.
b. with phagocytosis, the engulfed substances are in solution; with pinocytosis the engulfed substance are in particles.
o c. with phagocytosis the substance being consumed is preserved, but with pinocytosis the substance is destroyed.
o d. there is no significant difference.

a. With phagocytosis, the engulfed substances are in particles; with pinocytosis the engulfed substances are in solution.

Explanation:  

The phagocytosis can be define as cellular eating whereas the pinocytosis can be define as the cellular drinking. In phagocytosis the cell engulfs the whole particles, these particles are later broken down by the enzymes present in the phagocytic cell. But in the case of pinocytosis the cell engulfs the already dissolved and broken down food.  

molecules are free to separate from each other and will take on the shape of the container. molecules move completely at random and high speeds. they vibrate in a fixed position and do not move around much. molecules expand to the edge of their container.