Which statement is true for both incomplete and complete digestive systems?
a.
materials enter and exit through the same opening.
b.
digestion begins outside the cells.
c.
the digestive cavity is like a tube.
d.
continuous feeding is possible.

"Digestion begins outside the cells" is the statement among the following choices given in the question that is true for both incomplete and complete digestive systems. The correct option among all the options that are given in the question is the second option or option "B". I hope the answer helped you.