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340 million years ago asteroid impact and all the animals started getting killed off in order to feed us

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445 million years ago there was a very big ice age things began to get cold. Cooling, Falling sea levels and that in degrees but the water got colder and that killed the animals in the water. ( ice age)

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200 million years ago rapid global warming things just started getting hotter and hotter and not much could survive it. a lot of heat waves and it turned into a big dry lifeless desert.  There also was a increase of methane and CO2 and that removes oxygen.

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65 million years ago A very big asteroid it the earth and took out a lot of wildlife also the volcanic and the falling sea levels that slowly killed the water and ocean life.  ( Asteroid impact)

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65 million years ago widespread fires took out mostly everything and also did the ash cloud.  ( Nuclear winter)

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per 7

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Molecular evolution is the area of evolutionary biology that studies evolutionary change at the level of the DNA sequence. It includes the study of rates of sequence change, relative importance of adaptive and neutral changes, and changes in genome structure.https://www.nature.com/subjects/molecular-evolution

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https://www.nature.com/subjects/molecular-evolution

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The theory of recapitulation, also called the biogenetic law or embryological parallelism—often expressed using Ernst Haeckel's phrase "ontogeny recapitulatesphylogeny"—is a historical hypothesis that the development of the embryo of an animal, from fertilization to gestation or hatching http://2000clicks.com/graeme/langwisdomsayingontogenyrecapitulatesphylogeny.htm(ontogeny), goes through ...

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A rudimentary structure in humans corresponding to a functional structure or organ in ancestral animals.http://www.dictionary.com/browse/vestigial-organ

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A homologous structure is an example of an organ or bone that appears in different animals, underlining anatomical commonalities demonstrating descent from a common ancestor. In other words, it's when very different animals have bones that appear very similar in form or function and seem to be related.

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Genetic drift — along with natural selection, mutation, and migration — is one of the basic mechanisms of evolution.

In each generation, some individuals may, just by chance, leave behind a few more descendents (and genes, of course!) than other individuals. The genes of the next generation will be the genes of the "lucky" individuals, not necessarily the healthier or "better" individuals. That, in a nutshell, is genetic drift. It happens to ALL populations — there's no avoiding the vagaries of chance.

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sexual selection is a "special case" of natural selection. Sexual selection acts on an organism's ability to obtain (often by any means necessary!) or successfully copulate with a mate.

Selection makes many organisms go to extreme lengths for sex: peacocks (top left) maintain elaborate tails, elephant seals (top right) fight over territories, fruit flies perform dances, and some species deliver persuasive gifts. After all, what female Mormon cricket (bottom right) could resist the gift of a juicy sperm-packet? Going to even more extreme lengths, the male redback spider (bottom left) literally flings itself into the jaws of death in order to mate successfully.

Sexual selection is often powerful enough to produce features that are harmful to the individual's survival. For example, extravagant and colorful tail feathers or fins are likely to attract predators as well as interested members of the opposite sex.https://evolution.berkeley.edu/evolibrary/home.php

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is the process whereby organisms not closely related, independently evolve similar traits as a result of having to adapt to similar environments or ecological niches.

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Surfaces, or objects) side by side and having the same distance continuously between them. So the same

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Tending to be different or develop in different directions.

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A mutation is a change in DNA, the hereditary material of life. An organism's DNA affects how it looks, how it behaves, and its physiology. So a change in an organism's DNA can cause changes in all aspects of its life. Mutations are essential to evolution; they are the raw material of genetic variation.
https://evolution.berkeley.edu/evolibrary/article/mutations_01

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The process whereby organisms better adapted to their environment tend to survive and produce more offspring. The theory of its action was first fully expounded by Charles Darwin and is now believed to be the main process that brings about evolution.
http://www.dictionary.com/

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Variaton In all species, individuals differ in their genetic makeup, producing many
variations in their physical features; individuals in a population vary from
each other.
Inheritance Individuals pass some of their genetic material to their offspring; parents pass on their traits to their offspring.
Selection Some individuals have inherited character (genes) that allows them to better survive or produce more offspring. These offspring, in turn, are more likely to survive and create offspring of their own. As a result, their genes become more common in the entire population; some variants reproduce more than others.
Investigating VIST Evolutionary Principles - The University of Kansas