Answer the following question given this paragraph: At the end of the Precambrian, a mass extinction occurred. In a mass extinction , the majority of species die out. The Precambrian mass extinction was the first of six mass extinctions that occurred on Earth. It's not certain what caused this first mass extinction. Changes in Earth's geology and climate were no doubt involved. Q: What was the first mass extinction that occurred on earth? Choices: - late Devonian mass extinction - paleozoic mass extinction - proterozoic mass extinction - precambrian mass extinction A:
precambrian mass extinction
(Question)
Answer the following question given this paragraph: The scientific method is a set of steps that help us to answer questions. When we use logical steps and control the number of things that can be changed, we get better answers. As we test our ideas, we may come up with more questions. The basic sequence of steps followed in the scientific method is illustrated in Figure below . Q: In science, what can be described as a set of steps that help us to answer questions? Choices: - theory - hypothesis - scientific controls - scientific method A:
(Answer)
scientific method
Ques: Answer the following question given this paragraph: When electrons return to a lower energy level, they emit energy in the form of light. Q: When electrons return to a lower energy level, they emit the excess energy in the form of what? Choices: - weight - electricity - energy - light A:
Ans: light
(Q).
Answer the following question given this paragraph: Birds have light-weight bones that are filled with air. They also lack a jaw, which in many vertebrates is a dense, heavy bone with many teeth. Instead, birds have a light-weight keratin beak without teeth. Q: Birds have light-weight bones that are filled with what? Choices: - water - proteins - blood - air A:
(A).
air
Ques:Answer the following question given this paragraph: Many animal behaviors are ways that animals act, naturally. They don't have to learn how to behave in these ways. Cats are natural-born hunters. They don't need to learn how to hunt. Spiders spin their complex webs without learning how to do it from other spiders. Birds and wasps know how to build nests without being taught. These behaviors are called innate. Q: Behaviors that occur naturally and are not learned are called what? Choices: - adaptive - intuitive - acquired - innate A:

Ans:innate
Question: Answer the following question given this paragraph: Yeast is a facultative anaerobe. This means that alcohol fermentation takes place only if: a. the temperature is close to 37C b. the atmosphere does not contain oxygen c. sugar is provided to the cells d. light is provided to the cells. Q: What kind of anaerobe is yeast? Choices: - mutualistic - obligate - aerobic - facultative A:
Answer:
facultative