Because the Epiglottis covers the Larynx
Answer:
Most humans cannot see ultraviolet light because it has a smaller wavelength than violet light, putting it outside of the visible spectrum.

Answer:
Organism
Explanation:
The other options are all smaller than an organ system.
A cell is the smallest. Many cells make a tissue, many tissues form an organ and many organs form an organ system. Many organ systems form the organism :))
I could be wrong but I think it's c.
Ribosome: Is a complex molecular machine found within all living cells , that serves as the site of biological protein synthesis .
I hope that's help !