instruction:
Given a scientific passage and an answer, generate a question for the given answer.
question:
Passage: The surface seismic waves do the most damage because they only travel along the surface of the ground. Answer: surface
answer:
What type of seismic waves do the most damage?

question:
Passage: 41.4 Nitrogenous Wastes Ammonia is the waste produced by metabolism of nitrogen-containing compounds like proteins and nucleic acids. While aquatic animals can easily excrete ammonia into their watery surroundings, terrestrial animals have evolved special mechanisms to eliminate the toxic ammonia from their systems. Urea is the major byproduct of ammonia metabolism in vertebrate animals. Uric acid is the major byproduct of ammonia metabolism in birds, terrestrial arthropods, and reptiles. Answer: urea
answer:
When vertebrate animals metabolize ammonia what is the primary byproduct that is produced?

question:
Passage: One useful application of PET scanning is in the diagnosis of Alzheimer's disease. This debilitating condition associated with memory loss primarily occurs in elderly individuals. A protein known as beta-amyloid gradually forms deposits, or plaques, in the brain. Severe memory loss and impaired movement appear to be direct results of the plaque growth. Answer: elderly
answer:
Alzheimers disease is associated with memory loss in what group of people?