[Solved] The letter F in the image below of the paranasal sinuses labels the: A) ethmoid sinuses. B) sphenoid sinuses. C) maxillary sinuses. D) pharynx. 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. Sea Star: Marine invertebrates belonging to the class Asteroidea, known for their star-shaped body and ability to regenerate limbs.