During the first few days of human development, cell proliferation is very rapid, and as cells divide by mitosis, the G1 and G2 phases are very short. How do you think this impacts cell size during this period
of development?

c.

explanation:

  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-

space exploration has led to the development and technological improvement of many everyday items. (if this answer is wrong i will find the right answer) : )

i think it's c. if you look search electronic symbol on google and then click on wiki it shows you a