Two mechanical waves intersect and produce the straight line seen here. What is the result of this intersection called?

Ineed the answer to question 1 , i’m desperate

Which branches of natural science include the study of an organism that lived 10 million years ago

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.