Could a single person or animal be a cause of point-source pollution

Yes, a single person or an animal can be a cause of point-source pollution.

Explanation:

A point source pollution originates from a definite source or a particular location. This kind of water pollution can be monitored once the source is identified and traced. On the other hand, non-point source pollution is a result of various sources, which are not identified back to a single point.  

In the given case, a single individual or an animal can be a cause of point-source pollution. It is due to the fact that a single animal or an individual is a definite and individual source of pollution.  

  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-

that tool would be a compass