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Every living creature has DNA, which has a lot of inherited information about how the body builds itself.

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Darwin concluded that organisms have not remained the same since earth's beginning and realized that as new species arise, other ones become extinct.

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Fossil's Age Based on Sedimentary Layers

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Fossil's Age Based on Sedimentary Layers

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As one looks farther up, at younger and younger rock layers, the fossilized plants and animals become more and more familiar until they are a lot like organisms that are around now.

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Sedimentary rock is rock that is formed in layers by the depositing and pressing of sediments on top of each other.  The oldest layers are on the bottom, and the youngest layers are on the top.

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Not all species could have same features because of same ancestry but it could be because of the environment they have adapted to.

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Species may share similar physical features because the feature was present in a common ancestor.

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Biogeographical patterns provide clues about how species are related to each other.

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Organisms could have unique features according to their environmental setting but have distant relationships to ancestral species on mainland.

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According to Darwin-Wallace theory of evolution proposes, for a new species to arise, a group of individuals must become isolated ( geographically separated) from the rest.

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It is the study of the geographical distribution of organisms. 

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They started out the same, gradually evolving different traits, but that the basic plan for a creature's beginning remains the same. 

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For example, fish embryos and human embryos both have gill slits. In fish they develop into gills, but in humans they disappear before birth.

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Many traits of one type of animal appear in the embryo of another type of animal.

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The embryos of different organisms show similarity and are derived from common ancestors even though the adult organisms of that embryo are not similar.

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Embryo - is an unborn (or unborn or unhatched) animal or human young in its earliest phases.

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Shown above the picture, is a modern-day examples of evolution, it is the emergence of drug-resistant bacteria and pesticide- resistant insects and the mosquito population evolved resistance to the pesticide.

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Examples for the evidence for evolution often stems from direct observation of natural selection in the field and the laboratory.

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The Darwinian theory of evolution describes species changing over time and giving rise to new species as a result of descent with modification.

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During his journey, he realized that animals could become extinct, and life is constantly changing.

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Some populations, like those of microbes and some insects, evolve over relatively short time periods and can observed directly.

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(Similarities Among Living Organisms)

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Charles Robert Darwin was an English naturalist, geologist, and biologist, widely known for his contributions to evolutionary biology.

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Some ancient organism where remains are found and organisms alive today are look alike because they share common ancestors.

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The Fossils preserve remains of previously living organisms.

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Fossils document the existence of now-extinct species, showing that different organisms have lived on Earth during different periods of the planet's history.

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Scientist today analyze DNA to discover how closely organisms are related.

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The more similar the DNA, the more closely related the organisms.

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Living organisms arose in the place where similar forms once lived.

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Similar species who are found in the same places shows common ancestry.

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Embryos of many different kinds of animals look very similar and it is often difficult to tell them apart.

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Comparing embryonic development of different animals helps determine evolutionary relationships in nature.

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An evidence for evolution that we can see it taking place around us.