Why don’t plants need a digestive system? a. they do not need nutrients to grow and develop. b. they use energy from the sun to make their own food. c. they create oxygen, which they use as food. d. they absorb water and food through their roots.

Ultraviolet radiation is dangerous because it has a high enough energy to damage skin cells. what is the best explanation of the relationship between wavelength and wave energy? a) wave energy is related only to frequency, not wavelength. b) longer wavelengths have lower frequencies but higher energy. c) the shorter the wavelength, the lower the frequency and the higher the energy. d) the shorter the wavelength, the higher the frequency and the higher the energy.