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No, the human cannot see ultraviolet rays with the naked eye.
500 meter
the human heart can be seen with the naked eye if chest is open
When you look at your blood with the naked eye all you see is red liquid. This is all anyone sees with the naked eye.
the Oocyte is the largest human cell and can be seen by the naked eye. more information on the Oocyte: http://en.wikipedia.org/wiki/Oocyte
The term "naked eye" means that there is nothing helping the eye to see. for example, if you are using glassess or a telescpoe, then you are not using the naked eye.
You have a 3rd eye
Something that is so small that you cannot see it with the naked eye but must use a microscope to observe it
No. You can see leeches with the naked eye. Anything you can see with the naked eye is multicellular.
The three galaxies (other than our galaxie) that the naked eye can see is The Andromeda Galaxie, The Large Magellanic Cloud, and The Magellanic Cloud.
Because the spectrum of the eye cannot see things smaller them a crumb the size of a grain of dirt. so it can't see a germ
Bacteria are visible. The plaque on your teeth, or such foods as cheese is mostly bacteria, and you can see it. Though, these are millions of bacteria in a clump, and you can only see the clump, not the individual bacterium. So, if you are looking at one bacterum, only the largest bacterium can be seen with the naked human eye, since they are single-celled organisms. However, for most bacterium, you need visual enhancers, such as a microscope, to see a single specimine, because most types of bacteria are too small for the naked human eye.