An oscillator makes 360 vibrations in 3 minutes.
a. how many vibrations does it make in one minute?
b. how many vibrations does it make in one second?
c. what is its period in seconds?
d. what is its frequency in hertz?

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.