Ahuman hair is about 50 um thick. a pet flea is about 1 mm in size. how
many times smaller is the thickness of a human hair than a flea?

Polar bears give birth and hunt on sea ice. which of the following would polar bears survive during the melting of arctic ice? growing another layer of fur during summer migrate inland to search for different food sources staying put until the ice refreezes sticking to the usual diet of seals