Is polyurethane foam and polystyrene absorbing or releasing heat?

Which statement describes both homogeneous mixtures and heterogeneous mixtures?

Explain how the integumentary system plays a crucial role in the ability to maintain homeoestasis

What are the first two quantum numbers for the electrons located in subshell 4d? what are the first three quantum numbers for the electrons located in subshell 2s? how many electrons can be held in a sublevel l = 3? how many electrons can be held in the energy level n = 4? how many electrons in an atom can share the quantum numbers n = 4 and l = 3?