Before the invention of a compass sailors used stars to find direction .in which way is using the compass better ?

if the sky is cloudy the sailors will not be able to see the stars but the compass does not need the sky to be clear to tell the direction you are going.

a compass uses magnets to tell someone their direction because the north end attracts to the north pole pointing you north

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.