Generate a question with a factual answer.
Generated: If the opposite of springwood is summerwood, what's the opposite of earlywood?

Generate a question with a factual answer.
Generated: Some bilaterians without a brain are what?

Generate a question with a factual answer.
Generated: When was the Valencian regional exhibition held?

Generate a question with a factual answer.
Generated: What is formed when the collagen and elastic glycoproteins surrounding eukaryotic cells are calcified?