Big test! ! will give brainliest to correct answer and worth 50 points!

  the mississippians were considered to be  horticulturalists, which means they were

What is the most important factor in determining climates.

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.