Q: Given a scientific passage and an answer, generate a question for the given answer.
Passage: Vinegar is primarily an aqueous solution of acetic acid. Commercial vinegar typically contains 5.0 g of acetic acid in 95.0 g of water. What is the concentration of commercial vinegar? If only 3.1% of the acetic acid . Answer: spawning
A:
Pairs of fish that do not practice broadcast what may exhibit courtship behavior?