Answer: irregular,inconsistent, unsteady, uneven, shaky, fitful, patchy, variable, varying, changeable, changing, ever-changing, on-and-off, off-and-on, inconstant, erratic, haphazard, unstable, unsettled, spasmodic, sporadic, episodic, intermittent, occasional, unpunctual, wavering, fluctuating, aperiodic, unsystematic, unmethodical, ...
The correct answer is c, definitely
Because it is the main site for digestion. food is totally digested and absorbed in small intestine so it is long.
D. mitochondria is only in cellular respiration, so a plant cell would not need it, plus the bag is square
