Which theory or story states that amoeba-like forms over billions of years eventually evolved into humans?
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Evolution means the changes that occur in a population over time. In this definition, a “population” means a group of the same species that share a specific location and habitat. Evolutionary changes always occur on the genetic level. In other words, evolution is a process that results in changes that are passed on or inherited from generation to generation. It does not, for example, describe how people can change their muscle mass by lifting weights.
When successful, these genetic changes or adaptations, which happen when genes mutate and/or combine in different ways during reproduction, help organisms survive, reproduce, and raise offspring. Some individuals inherit characteristics that make them more successful at surviving and having babies. These advantageous characteristics tend to appear more frequently in the population (because those individuals with less advantageous characteristics are more likely to die without reproducing), and over time these changes become common throughout that population, ultimately leading to new species.
Some people dismiss evolution as “just a theory.” Evolution is in fact a theory, a scientific theory. In everyday use, the word theory often means a guess or a rough idea: “My theory is…” “I have a theory about that.” But among scientists, the word has an entirely different meaning. In science, a theory is an overarching explanation used to describe some aspect of the natural world that is supported by overwhelming evidence.
Other scientific theories include cell theory, which says that all living things are made up of cells, and heliocentric theory, which says the earth revolves around the sun instead of the other way around.
When successful, these genetic changes or adaptations, which happen when genes mutate and/or combine in different ways during reproduction, help organisms survive, reproduce, and raise offspring. Some individuals inherit characteristics that make them more successful at surviving and having babies. These advantageous characteristics tend to appear more frequently in the population (because those individuals with less advantageous characteristics are more likely to die without reproducing), and over time these changes become common throughout that population, ultimately leading to new species.
Some people dismiss evolution as “just a theory.” Evolution is in fact a theory, a scientific theory. In everyday use, the word theory often means a guess or a rough idea: “My theory is…” “I have a theory about that.” But among scientists, the word has an entirely different meaning. In science, a theory is an overarching explanation used to describe some aspect of the natural world that is supported by overwhelming evidence.
Other scientific theories include cell theory, which says that all living things are made up of cells, and heliocentric theory, which says the earth revolves around the sun instead of the other way around.
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