What form of light uses Doppler radar use?

Explanation:

Doppler radar works by sending a beam of electromagnetic radiation waves, tuned to a precise frequency, at a moving object. You can use Doppler radar on a stationary object, of course, but it's fairly uninteresting unless the target is moving

a.metals can become magnetic if they have many spinning electrons that create magnetic fields.d.only some metals are attracted by magnets; these metals are called ferromagnetic.

d.wrapping an insulated wire around a metal with ferromagnetic properties and applying an electric current.

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.