Unit 8 Week 1: Theory of Evolution by Natural Selection

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What is the theory of evolution by natural selection?

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The theory that explains how species change over time through the process where organisms better adapted to their environment tend to survive and produce more offspring.

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What is natural selection?

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A process in which organisms that are better adapted to their environment tend to survive and reproduce, leading to the evolution of species.

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What is an adaptation?

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A trait or characteristic that enhances an organism's ability to survive and reproduce in its environment.

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What role do genetic variations play in natural selection?

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Genetic variations provide the differences among individuals in a population, some of which may be advantageous for survival and reproduction.

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How does natural selection lead to evolution?

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Natural selection favors individuals with traits that enhance survival and reproduction, leading to changes in the traits of a population over generations.

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What is an example of an adaptation in animals?

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Thick fur and layers of fat in polar bears, which help them survive in cold environments.

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What is an example of an adaptation in plants?

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Some plants developing pesticide resistance, allowing them to survive in environments with chemical threats.

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What is the significance of Charles Darwin's observations?

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Darwin's observations of variations in species led to the formulation of the theory of evolution by natural selection.

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What is the fossil record?

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The fossil record is the history of life on Earth as documented by fossils, showing how species have changed over time.

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What does it mean for a species to change over time?

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It refers to the gradual alterations in the genetic makeup and traits of a species across generations.