What are the structural and functional differences between the epidermis and dermis

Dermis refers to the thick layer of living cells below the epidermis, which contains blood vessels, nerve endings, sweat glands, and hair follicles. It provides extensibility, strength, and firmness to the skin. Dermis helps the diffusion of oxygen and nutrients to the epidermis.

yes its like the dead sea which is full of salt which makes you stay afloat

so yes an egg will float in salt

any abiotic or biotic factor in an ecosystem that causes a population's size to slow or decrease is a limiting factor.