There are some that are dark green
Some can and some cant btw who uses this site? its not helpful at all!
nope
humans and other crabs
No, crabs.
black seaweed
the black stuff must mean that its dying
No. only some beaches have hermit crabs.
Ghost crabs like all crabs are decapods. This means that they have ten legs.
I don't know, I have had about 10 hermit crabs total and I've never heard it. But then, two of my hermit crabs died while molting... well, I still have 5 now.
cause GOD made them like that
All crabs are sea-dwellers. They can go onto land, but there are no land-based crabs.
It is all up to you. I like hermit crabs better, though.