Calculate the average atomic mass of an element from isotope data, Example: Element Y has two isotopes. One has a mass number of 10 and a relative
abundance of 20%. The other isotope has a mass number of 11 and a relative
abundance of 80%.

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