Pls Help -->Wildfires in Crater Lake burned approximately 33,000 acres in 2011, leaving 25 square miles of charred timber and bare ground. The five-week fire burned the loblolly pine trees and seeds for which Bastrop State Park is famous. Park rangers are hoping that new plant growth on the bare soil cover will eventually be established as pine trees; however, immediately following a wildfire, the first plants which emerge will most likely be grasses as a stage in- a primary succession
b. secondary succession
c. tertiary succession
d climax community ​

  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-