Yes. Some humanoid alien races look externally indistinguishable from Humans. But currenty, it is unknown.
No matter how often you ask, the only honest answer is that nobody has found ANY alien races so far, so nobody really knows anything about them for sure.
In my opinion, yes. Some alien races have peculiar appearances, except for some that are externally indistinguishable from humans and animals. But for now, it is unknown.
It is not currently known whether there even are any alien races. There might be, but this has not been confirmed so far.
No matter how often you ask, the only honest answer is that nobody has found ANY alien races so far, so nobody really knows anything about them for sure.
A humanoid is something that looks like a human being. An alien on the other hand is considered to be an extraterrestrial life form. Given those definitions, an alien could hypothetically also be humanoid if it looks like a human.
Yes. Some humanoid alien races look like anthropomorphic animals and plants. But currently, it is unknown.
Yes. Some alien races resemble anthropormorphic (i.e. humanoid) animals and plants. They come in all sizes and colors.
All humanoid alien races come in a great variety of colors, shapes, and sizes, and do not look or behave as expected.
Yes. All non-humanoid alien races come in all shapes, sizes, and colors. But currently, it is unknown.
Yes. All semi-humanoid alien races come in all shapes, sizes, and colors. But currently, it is unknown.
Yes. All alien races (i.e. humanoid, non-humanoid, and semi-humanoid) come in a great variety of shapes, sizes, colors, and skin textures.
Technically, humans are not a type of alien, since the word 'alien' pertains to 'foreign', and humans are not foreign. However, if there is another intelligent species that is out in space, humans would be alien to them. It all depends on your perspective.
Humans are alien to other Planets. The only place in the universe where humans are not alien is here on earth. However we can be alien to another nation in regards to race and culture.