The larynx is mostly made of cartilage, 3 paired (arytenoid, corniculate, cuneiform) and 3 unpaired (epiglottic, thyroid, and cricoid). The larynx is attached to the hyoid bone in humans and positioned lower in the throat. This decreases the nasality of the sound and increases the tonality as well as the resonance of the sound produced by the larynx which is required for effective communication.
Number 12: if people planted a lot more tress then the level of carbon dioxide would decrease because trees take in co2 and produce oxyen.
Fish, penguins, and dolphins all have the same basic shape because they all faced the same physical constraints during their evolution and converged upon the same body plan.
Hope I helped!
