THIS IS A PSYCHOLOGY QUESTION. Describe the major theories for the purpose of sleep. Why do we sleep?

Which type of neuroglia is found outside of the brain?

Why is earth's outer core hotter than earth’s oceanic crust? earth’s oceanic crust is denser than earth’s outer core is. earth’s oceanic crust has lava flowing from the mantle. earth’s outer core has a composition of solid iron and nickel. earth’s outer core is deeper within earth than oceanic crust is.

During the process of blank and molecules such as a glucose must use a protein channel to cross through a cell membrane