Given a scientific passage and an answer, generate a question for the given answer.

Q: Passage: Biotic factors are all of the living or once-living aspects of the environment. They include all the organisms that live there as well as the remains of dead organisms. Answer: biotic factors

A: What are all of the living or once-living aspects of the environment called?
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Q: Passage: Neutralization reactions between an acid and a base yield a salt and water. In some cases, this results in a completely neutral solution. However, some salts are weakly acidic or basic. How can we tell whether a given salt will act as an acid or base? Looking at the relative strengths of the acid and base that were used to form the salt can give us information on the acid-base properties of the resulting solution. Answer: neutralization

A: What kind of reactions between an acid and a base yield a salt and water?
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Q: Passage: The age-sex structure of a population is the number of individuals of each sex and age in the population. Age-sex structure influences population growth. It is represented by a population pyramid. The number of survivors at each age is plotted on a survivorship curve. Answer: population pyramid

A:
What helps represent age-sex structure of the population?
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