Answer the following question given this paragraph: At the beginning of the reaction, only the reactants A and B are present. Recall that over the course of a reaction, the reaction rate slows down. This is because the rate depends on the concentrations of one or more reactants. As the reactants are used up, their concentrations drop, thus decreasing the reaction rate. Q: What happens to the reaction rate over the course of a reaction? Choices: - reverses - stays the same - speeds up - slows down A:
slows down
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Answer the following question given this paragraph: Q: A penguin must do what before molting? Choices: - hibernate - use muscle mass - mate - increase muscle mass A:
increase muscle mass
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Answer the following question given this paragraph: Early vertebrates were ectothermic. Ectothermy means controlling body temperature to just a limited extent from the outside by changing behavior. For example, an ectotherm might stay in the shade to keep cool on a hot, sunny day. On a cold day, an ectotherm might bask in the sun to warm up, like the snake in Figure below . Almost all living fish, amphibians, and reptiles are ectothermic. They can raise or lower their body temperature by their behavior but not by very much. In cold weather, an ectotherm cools down. As its body temperature drops, its metabolism slows down and it becomes inactive. Q: What type of vertebrates control body temperature to just a limited extent from the outside by changing behavior? Choices: - etheric - endothermic - mimetic - ectothermic A:
ectothermic
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Answer the following question given this paragraph: Silver is used to make sterling silver jewelry. Table salt is the mineral halite. Glass is produced from the mineral quartz. Q: What mineral is used to produce glass? Choices: - lead - feldspar - pyrite - quartz A:
quartz
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