Given scientific fact as input, generate the question from this fact such that it can be answered from the input.

Ex Input:
Sporopollenin protects the pollen of seed plants and spores of seedless plants.

Ex Output:
What protects the pollen of seed plants and spores of seedless plants?


Ex Input:
When the smooth muscle relaxes, the arterioles dilate, allowing blood to enter the capillaries.

Ex Output:
When the smooth muscle relaxes, the arterioles dilate, allowing blood to enter the what?


Ex Input:
Bacteria are like eukaryotic cells in that they have cytoplasm, ribosomes, and a?

Ex Output:

Bacteria are like eukaryotic cells in that they have cytoplasm, ribosomes, and a?