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natural selection arising through preference by one sex

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accumulation of differences between groups which can lead to the formation of new species

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long-distance movement of individuals, usually on a seasonal basis.
The movement and exchange of gene or alleles from one population of species to another.

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A mutation occurs when a DNA gene is damaged or changed in such a way as to alter the genetic message carried by that gene

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The process in nature  organisms that are better adapted to their environment tend to survive longer and transmit more of their genetic characteristics to succeeding generations

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Variation
Inheritance
Selection
Time

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                           5 major extinction 

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                           5 major extinction 

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The K-T extinction.
It is the most resent extinction. it killed off all dinosaurs, as well as roughly half of all species on the planet. What caused the extinction was a impact with an asteroid or comet.

Triassic-Jurassic Extinction.
It happened about 200 million years ago and kill off mammal - like creatures as well roughly half of all species on the plant. What caused the extinction was massive volcanic eruptions at the "Central Atlantic magmatic province,"

The Permian-Triassic Extinction.
It happened roughly 250 million years ago. Though to be the worst in all history because around 96% of species were lost. Caused by an enormous volcanic eruption that filled the air with carbon dioxide.

Late Devonian Extinction
75% of species were lost around 364 million years ago. It is unclear as to whether the late Devonian extinction was one single major event or spread over hundreds of thousands of years.

Ordovician–Silurian Extinction
Around 439 million years ago, 86% of life on Earth was wiped out. Scientists believe two major events resulted in this extinction. One was rising sea levels and glaciation.