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How Does Evolution Really Work? Tyler Kendall Justin Spackman Genetic Variation The characteristics that help an individual to survive This happens by genetic mutations Example: a hummingbird having a longer beak to be able to get more nectar Overproduction of Offspring The Animal species have more offspring than what the environment can support This creates a struggle for survival Example: a turtle laying 100 eggs, but only 4 survive because of the struggle for survival Struggle for Existence Struggle for existence leads to competition within a species Natural selection will favor those with better traits Example: Rocky Mountain Bighorn Sheep fighting for a mate to create offspring Differential Survival and Reproduction Organisms evolve to fit their environment This helps them to survive better Example: Giraffes having longer necks in an environment with tall trees so the giraffes can eat more of the leaves Response and Questions We learned that evolution occurs from natural selection And natural selection is composed of four things, genetic variation, overproduction of offspring, struggle for existence, differential survival and reproduction. Question we still have are could different species of animals evolve through natural selection into the same species?