I believe the answer is D. The organisms would require an outlet for their waste.
One of the differences between normal stem cells and cancer stem cells is their degree of dependence on the stem cell niche, a specialized microenvironment in which stem cells reside.
Cancer stem cells are mostly quiescent, since they replicate very slowly, while the progenitor cells grow and replicate much faster.
Plate tectonics suggests that the lithosphere floats and moves on the asthenosphere.
so the other answer is incorrect.
