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Sample answer: Mutations frequently occur when genetic material is replicated, which happens when a virus reproduces. The faster a virus or cell reproduces, the more mutations occur.
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The theory of evolution states that organisms alive today evolved by natural selection from other species that are now extinct. (a) Which two scientists proposed the theory of evolution by natural selection?
Explain how the writings of Charles Lyell and Thomas Malthus helped Darwin develop his theory of evolution by natural selection. Discuss the role artificial selection had on Darwin's theory.
Evolution can be described as a change in allelic frequencies of a gene pool over time. Natural selection can place pressure on specific phenotypes and cause a change in the frequency of the alleles that produce the phenotypes.
9. Identify the type of cell transport involved in each of the following descriptions. Use the key provided to indicate your answers. A. active transport B. diffusion C. endocytosis D. passive transport E. osmosis F. exocytosis D, E Movement of water across a semipermeable membrane down its concentration gradient. D, B
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