Element Y has a half-life of 120 years. If you started off with a sample of 280 atoms of Element Y, how many would be left after 3 half-lives?(select answer one of the choices)
A)70
B)140
C)28
D)35

The grooves or folds of the brain are called

37.0 °c = °f (human body normal temperature)

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