An em wave has a speed of 3 x 10 ^ 8 m/s and a wavelength of 6 x 10 ^ -7 m. what is the frequency of the wave? 90 hz 180 hz 2 x 10 ^ -15 hz 5 x 10 ^ 14 hz

the skeletons of most mammals reach a certain size and then stop growing. however, many animals, including some mammals, keep growing throughout their lives. kangaroos, for example, just keep growing and growing until they die. also, the longer an animal lives the greater the chance it might catch some deadly disease.

k2s for potassium sulphide