Evolution. Excel Science 10 Mr. Evans. Evolution. Definition The process by which species change over time. The theory of evolution is accepted as the central theme of modern biology. Evolution.
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An individual may be born with characteristics that make it stronger, faster, or some other advantage that will help the individual survive and reproduce.
These appeared randomly
These “better” characteristics are passed on to the offspring and are likely to appear more often through oncoming generations so that eventually the species changes and all individuals possess the “better” characteristics.
The opposite occurs for less desirable characteristics
If the death rate exceeds the birth rate a species is susceptible to extinction.
Generally extinction is the result of environmental change.
The Fossil Record shows that throughout geologic history millions of species have come into existence, evolved, survived successfully for a time, failed to adapt to environmental change, and become extinct.
The great majority of all species that have lived on Earth have become extinct.