Living Environment State Labs Regents Review

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What is natural selection?

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Natural selection is the process by which organisms better adapted to their environment tend to survive and produce more offspring. It is a key mechanism of evolution.

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What is the significance of biodiversity in ecosystems?

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Biodiversity contributes to ecosystem resilience, productivity, and stability. It provides a variety of resources and services, including food, medicine, and clean water.

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What is gel electrophoresis used for?

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Gel electrophoresis is a laboratory technique used to separate DNA, RNA, or proteins based on their size and charge, helping to analyze genetic relationships.

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Define extinction and its impact on ecosystems.

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Extinction is the end of an organism or a group of organisms. It can lead to loss of biodiversity and disrupt ecosystem balance.

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What role do plants play in the food chain?

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Plants are primary producers that convert sunlight into energy through photosynthesis, forming the base of the food chain.

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What is the difference between a hypothesis and a theory?

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A hypothesis is a testable prediction about the relationship between variables, while a theory is a well-substantiated explanation of an aspect of the natural world.

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Explain the concept of an ecosystem.

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An ecosystem is a community of living organisms interacting with their physical environment, including both biotic (living) and abiotic (non-living) components.

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What is the function of a dichotomous key?

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A dichotomous key is a tool that allows the identification of organisms based on a series of choices that lead the user to the correct name of a given item.

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What is the importance of medicinal plants?

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Medicinal plants are crucial for developing new medicines and treatments, and their conservation is vital for future healthcare.

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What is the process of ecological succession?

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Ecological succession is the gradual process of change and replacement in the species composition of a given area over time.