Smooth muscle lines the walls of many of the
organs that make up the digestive system. The
smooth muscle contracts in ways to move the
food through the digestive system in a
process called peristalsis. The smooth muscle
found in the walls of the stomach and
intestines is considered which of the
following?
A. cell
B. organ
C. organism
D. tissue

B. organ

Explanation:

Smooth muscle is found in the walls of hollow organs like your intestines and stomach. They work automatically without you being aware of them. Smooth muscles are involved in many 'housekeeping' functions of the body.

  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-

colorless gas, exhibiting a blue glow when placed in an electric field

b) solid

its a type of rock