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the biogenetic law theorizes that the stages an animal embryo undergoes during development are a chronological replay of that species past evolutionary forms.

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area of evolutionary biology that studies evolutionary change at the level of the DNA sequence.

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variation in the relative frequency of different genotypes in a smal population. owing to the chance disapperance of particular genes as individuals die or do not reproduce.

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remnants of lost functions that our ancestors possessed.

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natural selection arising through preference by one sex for certain characteristics in individuals of the other sex.

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the changing of the structure of a gene, resulting in a varient form that may be transmitted to subseequent generations

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the reduced genetic diversity which results when a population is descended from a small number of colonizing ancestors.

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extreme example of genetic drift that happens when a size of a population is severly reduced.

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organisms better adapted to their enviorment tend to survive and produce more

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v=mutation
i=dna and sexual selection
a=selection
t=migration

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https://www.britannica.com/science/Ordovician-Silurian-extinction

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https://www.britannica.com/science/Devonian-extinctions

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https://www.britannica.com/science/Permian-extinction

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https://www.britannica.com/science/K-T-extinction

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https://www.britannica.com/science/end-Triassic-extinction

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a global extinction event responsible for eliminating around 80 percent of all speices of animals ,  about 66 million years ago. The only species that survived the extinction were the lineages that led to modern birds and crocodilians. Some of there main guesses to the extinctions were causes include disease, heat waves and resulting sterility, freezing cold spells, the rise of egg-eating mammals, and X-rays from a nearby exploding supernova.

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Cretaceous-tertairy

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global extinction event occurring at the end of the Triassic period  (252 million to 201 million years ago) that resulted in the death of some 76 percent of all marine and terrestrial species and about 20 percent of all taxonomic families.The cause of the end-Triassic extinction is unknown. Many scientists contend that this event was caused by climate change and rising sea levels resulting from the sudden release of large amounts of carbon dioxide.

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Triassic-jurassic

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a series of extinction pulses that contributed to the greatest mass extinction in Earth’s history. Many geologists and paleontologists thought that the Permian extinction happened over 15 million years during the latter part of the Permian period(299 million to 252 million years ago).Permian extinction events have focused on how biological and physical causes disrupted nutrient cycles. Hypotheses of temperature crises, especially of those occurring in shallow marine (surface) waters,

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Permian-triassic

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This extinction affected mostly the marine communites , (419.2 million to 359 million years ago ) It was impossible to blame this on any one cause, some of there best guesses were, ecsessive sedimentation, rapid global warming, bolide impacts, or massive nutrient runoffs.

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Devonian

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This was a global extinction event occuring during the Hirnantian Age (445.2 million to 443.8 million years ago) This extinction seemed to happen in phases, some paleontologist suggest that an early phase affecting graptolits , branchiopods, and trilobites took place prior to the end of the Orodovician period,

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Orodovician-silurian