Which statement best represents a proper hypothesis? I think there is no effect on hearing if you listen to loud music for only three hours a day.

Grapes taste better than apples because grapes are sweeter.

If different types of leaves are exposed to low temperatures, then they will change colors.

Water will flow faster through tightly packed soil than through loosely packed soil.

  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-

i do not get it   at all