The waste products of metabolism
Tends to accumulate and from it
They must be excreted
In simpler organisms
In which circulatory system are not developed
The tissue fluid is the dominant fluid

Waste restricts of body pass slowly
Along the tubules
To be eliminated at the exterior of the worm
The rotting flesh can't be consumed
The rotting blood can't be excreted

While cadaver waits in his grave
No oxygen and food to cells
Dead mechanism of the body consumer
Go to the grave
Eat across the mud
Visceras