Crabs outgrow and then shed their skins
Yes, its very healthy for them.
EXUVIAE - the cast-off skins of various organisms, such as the shells of crabs or larvae of insects
They do shed their skin (shell) several times each year as they grow larger.
Crabs have gills. The underwater ones have larger gills than the terrestrial ones. Terrestrial crabs use the humidity in the air to breathe. this is why crabs live near water even if they are land dwellers. some crabs have very small and basic lungs but these cannot function without water and are usually attached to some sort of gill.
Tough skins to minimize water loss
Habitat loss, indiscriminate hunting led to the loss of many tigers. Also, many are poached for the quack Chinese medicine trade and for their skins.
To an extent, yes, it depends on the species of crab Dungeoness crabs, and blue crabs (The most common in seafood resturaunts) have bristle like things around the edge of the sockets that brushes the debris from the eyes. Land crabs like Patriot crabs and ghost crabs have foldable "Mouth Hands" that are basically like little windshield wipers. The exeption to the land crabs is the Halloween Crab which have eye mor similar to Dungeoness crabs. Hermit crabs and subsequently crabs with similar front structure like Japanese spider crabs can fold their eyes down and also have "Mouth Hands" although all crabs have a thin, nearly invisible, coat of skin covering their eyes if you wish to see it I suggest looking for molted crab skins on the beach. Hope this helped!
yes
Loss of tanning rate, water, quick sand, death and crabs (not that type)
Cicadas shed their skin because they are insects. All insects shed their skin. It is called molting. An insect goes through several molts before it becomes an adult with wings. Cicadas simply climb trees and then shed their skins. They are easier to find. Not only do insects spread their skins but so do spiders and crabs. Some snakes shed their skins and some birds shed their feathers.
Yes, they do. In fact, when they do, it looks like pieces of a whole new crawdad. I know this because there is a crawdad I caught from a stream across my street, and I am watching it shed its skin.
Whales and Seals have a layer of fat under their skins which act as an insulator/prevent heat loss from their bodies