A toaster produces 50 units of heat and 5 units of light for every 100 units of electricity it uses. What is the efficiency of the toaster

unlike poles attract

nah.   i'm just sleepy.

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.