What topic in a biology textbook is directly related to physics

Groups of organs that work together to complete a process in the body are called: a. cells b. tissues c. nerves d. systems

Will you chech and finish these for me, because i am stumped with them.

The solar panels used by mark function because of the photoelectric effect. light shines on the cells causing electrons to be ejected from the metal, which produces an electric current. at night on mars, no light will fall on the solar cells and no electric current will be generated. according to your notes, what type of light is typically needed to cause the photoelectric effect? a)visible b)ultraviolet c)infrared