Because you touch yourself at night!
Usually a planaria regeneration experiment involves cutting the planaria into different parts. The head can be separated from the tail or the planaria can be cut lengthwise, etc. After cutting the planaria, it will be observed for few days noting how the organism regenerate its lost body parts. Read more on planaria regeneration on t he link provided below.
The sponges reproduce by (a) budding or (b) regeneration
The ability of a sponge to regrow missing parts is called regeneration. Sponges are capable of regenerating damaged or lost tissue, allowing them to recover from injuries and continue to thrive in their environment.
5 to 10 minutes
starfish
Ducks Are Not Capable. Trust Me... I Kno.. Sea Stars Are
Regeneration is the reformation/healing or regrowing of cells and or limbs. Most usually if you chop a sponge it would regenerate if not make two sponges.
liver
it has no muscles thats how it can function
The planaria class is Turbellaria
newts are capable of regenerating body parts like limbs,eye lenses e.t.c.starfishes are also capable of regeneration
planeriacomes under kingdom animalea