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It occurred 65 million years ago at the end of the cretaceous period. Non avian dinosaurs and vertebrates including the flying pterosaurs went extinct. Also important marine invertebrate also went extinct. Some examples of marine invertebrate that went extinct were ammonite, gryphaeid, and inoceramide. The cause of this event was an asteroid that was 10 kilometers(6 miles long). It caused dust clouds that would cover the entire planet. It would have cause plants to die and that would result in herbivores and carnivores dying.

http://samnoblemuseum.ou.edu/understanding-extinction/mass-extinctions/end-cretaceous-extinction/

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This extinction occurred at the end of the Triassic period (252 million to 201 million years ago. 76% of all marine and terrestrial species died. This extinction was the key moment that allowed dinosaurs the dominant land animal on earth. This ranks the fourth worst extinction event out of all five. Many scientist contend that this event was cause by climate change and rising sea levels resulting from a sudden release of large amount of carbon dioxide.

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

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This extinction is considered one of the worst extinctions. It wiped out 90% of sea species and 70% of vertebrate animal species on land. It also stripped Earth of many rooted plants causing severe erosion.  No one knows what the cause of the extinction was but there is many theory to it. Some suspect it to be a comet or asteroid impact. Others believe it to be floods of lava from the Siberian traps and related loss of oxygen in the seas. Two other things it could be is climate change or radiation from nearby supernovas or other cosmic explosion could be the cause

http://earthsci.org/fossils/space/craters/permian/permian.html

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It is considered to be a prolong marine biotic crisis extending for 20-25 million years and punctuation by 8-10 extinction events. One event was the Kellwasser Event  that accounted for the extinction of about 20% of all animal families and 70-80% of all animal species. The Hangeberg event accounted for about 16% percent of marine families. There is a variety of causes proposed and these include asteroid impacts, global anoxia(widespread dissolved oxygen shortages), plate tectonics, sea level changes, and climate change.

http://www.devoniantimes.org/opportunity/massExtinction.html

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Was the third largest of the five major extinction events. This was the second biggest extinction of marine life, more than 60 per cent of marine invertebrates died. The cause appears to have been the continental drift of a significant landmass into the south polar region, causing a global temperature drop, glaciation, and consequent lowering of the sea level, which destroyed species' habitats around the continental shelves. This glaciation event also caused a lowering of sea level  worldwide. The extinction occurred 443.7 million years ago and over around 100 marine families became extinct. Covering about 49% of faunal (animal) and brachiopods and bryozoans were decimated, along with many of the trilobite, conodont and graptolite families. The most commonly accepted theory is they were it was triggered by the onset of a long ice age.  The end of the second event occurred when melting glaciers caused the sea level to rise and stabilize once more.

http://www.oldearth.org/curriculum/history/earth_history_c4_Ordovician_extinction.htm

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the process of change in the sequence composition of cellular molecules such as DNA, RNA, and proteins across generations.

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The development of an organism expresses all the intermediate forms of its ancestors throughout evolution.

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A rudimentary structure in humans corresponding to a functional structure or organ in ancestral animals.

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n example of an organ or bone that appears in different animals, underlining anatomical commonalities demonstrating descent from a common ancestor.

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Variation in the relative frequency of different genotypes in a small population, owing to the chance disappearance of particular genes as individuals die or do not reproduce.

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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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Divergent, Parallel and Convergent Evolution 

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Divergent, Parallel and Convergent Evolution 

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The independent evolution of similar features in species of different lineages.

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The transfer of genetic   variation from one population to another. ... Immigration may also result in the addition of new genetic variants to the established gene  pool of a particular species or population.

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Occurs when a DNA  is damaged or changed in such a way  at to alter the genetic message carried by that gene.

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The process where organisms better adapt to there environments tend to survive and produce more offspring.

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Variation-Mutation
Inheritance-DNA and sexual selection
Selection-selection and Genetic drift
time-migration / Gene Flow

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Researching and explaining the 5 major extinctions.

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Researching and explaining the 5 major extinctions.