[Solved] Some of the key characteristics associated with charismatic leaders include: A) visionary skills. B) communication skills. C) motivation skills. D) all of these. E) none of these. Plankton: Free-floating, mainly microscopic aquatic organisms found in the upper layers of the water; consisting of phytoplankton and zooplankton. Compare with nekton. Microscopic Organisms: Organisms too small to be seen with the naked eye, often including bacteria, archaea, some fungi, and protists. Anus: The distal end and outlet of the digestive tract. Mouth: The opening in the face of a person or animal, used for eating, breathing, and speaking.