A is formed in the atmosphere when 2 or more pollutants react in the presence of sunlight to form another substance. a. primary pollutant
b. secondary pollutant
c. tertiary pollutant
d. point source pollution

Can someone me with questions 15 to 17 plz.

Most metamorphosis processes take place

Which statement is true about the model of the electromagnetic spectrum a: it change the frequencies of light. b: it compare wavelengths of light. c: the color of light waves can be changed using the model. d: the intensities of light waves can be decreased using the model.