Answer the following question given this paragraph: Q: The main advantage of urea is its very low what? Choices: - temperature - cost - energy requirement - toxicity A:
toxicity
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Answer the following question given this paragraph: Forest and Kim Starr (Flickr:Starr Environmental). Secondary succession occurs when nature reclaims areas formerly occupied by life . CC BY 2.0. Q: What occurs when nature reclaims areas formerly occupied by life? Choices: - typical succession - tertiary succession - primary succession - secondary succession A:
secondary succession
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Answer the following question given this paragraph: Energy is defined as the ability to cause changes in matter. You can change energy from one form to another when you lift your arm or take a step. In each case, energy is used to move matter you. The energy of moving matter is called kinetic energy . Q: What is defined as the ability to cause changes in matter? Choices: - evolution - momentum - nuclear - energy A:
energy
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Answer the following question given this paragraph: Viroids Viroids are plant pathogens: small, single-stranded, circular RNA particles that are much simpler than a virus. They do not have a capsid or outer envelope, but like viruses can reproduce only within a host cell. Viroids do not, however, manufacture any proteins, and they only produce a single, specific RNA molecule. Human diseases caused by viroids have yet to be identified. Viroids are known to infect plants (Figure 21.18) and are responsible for crop failures and the loss of millions of dollars in agricultural revenue each year. Some of the plants they infect include potatoes, cucumbers, tomatoes, chrysanthemums, avocados, and coconut palms. Q: Viroids are plant pathogens much simpler than what, but like them can reproduce only within a host cell? Choices: - pests - bacteria - parasites - viruses A:
viruses
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