Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
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Question: Phosphate groups are found within phospholipids and nucleotides.

Answer: Phosphate groups are found within phospholipids and what else?

Question: Most protein antigens require signals from helper t cells (th2) to proceed to make antibody.

Answer: Most protein antigens require signals from helper t cells (th2) to proceed to make what?

Question: Vascular plants have a dominant sporophyte generation.

Answer:
Do nonvascular or vascular plants have a dominant sporophyte generation?