Final answer:
If you observed a single-celled organism in pond water that was green in color and had a whip-like tail, you could conclude that this organism is capable of movement.
Step-by-step explanation:
If you observed a single-celled organism in pond water that was green in color and had a whip-like tail, you could conclude that this organism is capable of movement. The whip-like tail, which is called a flagellum, is used by some microorganisms, such as flagellates or euglenoids, to move through the water and navigate their environment.
Learn more about movement capability of a single-celled organism