Abrief description of a molecular signal

Which of the following best describes the formation of plasma?

Which statement correctly describes metallic bonds? a. they form when certain atoms lose electrons and other atoms gain electrons. b. they involve an attraction between anions and cations. they always involvpoth a metal and a nonmetal. d. they can only form between atoms of the same element. e. they form because electrons can move freely between atoms.

All cells are made of four types of acids, lipids, proteins, and carbohydrates.