. The table below compares the economies of two countries. Country A Country B Main crop is wheat Main crops are wheat, corn, and potatoes Primary product is flour Produces a variety of products including flour, processed foods, and bio-fuels

Different isotopes indicate that an element will have different numbers of

The same side of the moon always faces earth because the

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.