instruction:
Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
question:
Filter feeders called rotifers collect digestive and excretory wastes in cloacal bladder primitive organ.
answer:
Filter feeders called rotifers collect digestive and excretory wastes in what primitive organ?


question:
Simple kind of diffusion do small hydrophobic molecules squeeze through lipid molecules.
answer:
What kind of diffusion do small hydrophobic molecules squeeze through lipid molecules?


question:
Beta decay occurs when an unstable nucleus emits a beta particle and energy.
answer:

What occurs when an unstable nucleus emits a beta particle and energy?