The "life cycle" would be broken and life on earth would stop.
No. The complex substances which they are made of change before that can happen. The changes are complex, but they generally end up with charring, that is breaking down to simpler substances including carbon.
Without decomposers dead animals would just lay dead on earth forever.
Well, it doesn't happen in plants or bacteria, if that's what you're asking. :P It can happen to humans too.
hello
The bacteria cell will have jam on it.
in liquids and gases
move!
To obtain new substances a chemical reaction is needed.
Nothing would happen. Humans ARE animals.
the bacteria is killed by the acid in the stomach.
die
Some bacteria will appear purple, whereas other bacteria will appear red.