Hermit Crabs eat Fruits, Vegetables, and, if you go to Petsmart, or Petco, you can buy this thing called Hermit Crab Food the company is Zoo Med. You also need to choose the right inviroment for your crab. I'd recomend the "Crab Shack" company, they have some cool cages that come with the Misters and the food bowel and theres a sponge shaped like a star in it but, you have to spray Distilled water on it because regular water would kill the Hermit Crab. It's what they use for their water source. That's what the spray bottle is for. It has distilled water in it already. They are also very sensitive, one of mine pinched me twice, it really hurt. So, do not ever touch there pinchers. And, you sholdn't ever put you face right in theirs, it really scares them, and they might not come out of their shell for a while. When it comes to feeding, just put them in the food bowel and they will climb out then they are done. They will go to the sponge themselves if they are thirsty. The last thing is, if they start acting ill, there is not much you can do. Just kill it, and put it out of it's misery. Most vets do not know how to treat crab sicknesses. So, they will tell you the same thing. I might not be exactly right about everything here though.
humans and other crabs
No. only some beaches have hermit crabs.
Ghost crabs like all crabs are decapods. This means that they have ten legs.
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.
crabs are hard to catch in winter
All animals with exoskeletons, including crabs, molt.
Crabs are found in all waters not just tropical.
there are 5 crabs on the left side of the beach and 3 crabs on the right side of the beach
some are but not all are.
Crustateans
Yes. They all pinch.