Natural selection is the process by which, all organisms survive, individuals better adapted to their environment survive and reproduce, humans create new species, genes disappear, Competition refers to, cooperation among organisms, struggle for food, water, and shelter, gene expression, artificial breeding, Darwin searched for a mechanism to explain, artificial breeding only, D. extinction of dinosaurs, how evolution occurs, fossil formation, Artificial selection occurs when, humans breed organisms for desired traits, mutations happen, competition increases, nature selects traits, Natural selection was influenced by the ideas of, Gregor Mendel, Alfred Russel Wallace, Thomas Malthus, Charles Lyell, Organisms produce many offspring because, all will survive, resources are unlimited, mutations stop, not all offspring will survive, Over time, helpful traits in a population, decrease, remain unchanged, increase, disappear immediately, Alfred Russel Wallace, opposed Darwin’s ideas, discovered the same idea as Darwin, discovered genes, rejected evolution, Overproduction means, species produce more offspring than can survive, organisms produce fewer offspring, resources increase, mutations stop, Variation in a population refers to differences in, oxygen levels, traits among individuals, rocks, B. weather, Variation is inherited through, water, competition, genes, fossils, Competition occurs because, mutations increase, resources are unlimited, organisms do not reproduce, there are not enough resources for all individuals, An adaptation is a trait that, decreases survival, improves survival and reproduction, stops gene expression, changes instantly, Environmental changes can, affect which traits are helpful, stop competition, remove variation, prevent evolution, Gregor Mendel showed that, fossils cause evolution, parents pass genes to offspring, mutations are always harmful, artificial selection is natural, A mutation is, a change in genetic material, competition, gene expression, a fossil, Only mutations in __________ can be inherited., body cells, skin cells, reproductive cells, muscle cells, Epigenetics studies, fossil layers, changes in DNA sequence, chemical changes that turn genes on or off, artificial selection, Gene expression refers to, the shape of DNA, how genes are turned on or off, fossil formation, extinction, Natural events like windstorms can, stop mutation, remove variation completely, prevent competition, shift population traits over time.

Natural selection

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