yes
In large amounts, yeast is visible to the unaided eye, but a single yeast plant is not.
Jupiter
using your unaided eye compare the image of the letter
No airport on earth can be seen from the surface of the moon by the unaided eye.
Neptune.
Yes, Saturn is often easy to see.
Microbiology is the study of living things too small to be seen by the unaided eye, such as bacteria, viruses, and fungi. It involves studying their structure, function, and behavior.
raccon
No. Its brightness is below the limit of sensitivity for the unaided human eye.
Telescopes and binoculars, although a lot can be seen with an unaided eye.
Yes, all constellations have at least some stars that can be seen with the unaided eye.
The smallest size of a cell that can be seen with the unaided human eye is about 100 microns, which is roughly the size of a grain of sand. Anything smaller than that would generally require a microscope to be visible.