After playing a video game about frogs, Shana and Aurlyn want to know how quickly their pet frog, Skipper, can hop. What could Shana and Aurlyn do to find the answer? A
They could take Skipper outside and see how long it takes him to hop 2 meters.
B
They could take Skipper outside many times to see how long it takes him to do one hop each time.
с
They could take Skipper outside and see how long it takes him to hop 0.5 meters up into the air.
D
They could take Skipper outside and see how long it takes him to get his back legs off the ground.

water is used to store them because it would keep the radiation from getting out in the open and causing harm to the workers

  the   balanced   equation   for   reaction of   ca metal   with   o2 to   produce   cao   is as below

2 ca+ o2→ 2 cao2

  explanation

the reaction is   balanced     since the   number of atoms   in reactant side is   equal to   number of atoms   in   product side.   for   example   they   are 2   atom of   ca in   reactant   side   and   2   atoms of ca   in   the product side.

  the   process   is a   meet the   requirement   of   redox   reaction because :     calcium   is   oxidized   from   oxidation state 0   to 2+   while   oxygen   is reduced from   oxidation   state   0   to 2-