Answer:
write full question please
Their shells protect them against predators and rough elements. Crabs have tight grips with their pincers, which allows them to grab hold of predators and fend them off. ... Their ability to condense their bodes enables crabs to take cover under rocks and other objects to hide from predators.
A hard outer shell offers protection against predators, in addition to the crab's claws, which they use to hunt prey or fight off predators.
Answer:
it enter through the ecosystem though the sun and later exists the ecosystem once the organisms in the food chain and the different trophic levels consume as much as they need in order to carry out their natural day-to-day process. Organisms release this energy in the form of heat back into the biosphere. hope this helps :)
