Check all statements below that are true. All organisms must compete for survival.

When organisms struggle to survive, they usually mutate to increase chances of reproduction.

Some organisms have phenotypes that make them better competitors than others in their environment.

Animals undergo natural selection, but plants and other organisms generally do not.

Natural selection continues to occur even today.

Phenotypes found in the most successful members of a species become the most prevalent after several generations.

A decrease in food availability will increase the variation in a population

  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-