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is the process of change in the sequence of cellular molecules like DNA, RNA, and proteins, across generations.

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Biological hypothesis that the development of the embryo of an animal, fetus or inside an egg, goes through stages resembling or representing successive stages in the evolution of the animals ancestors.

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These included the muscles of the ear, wisdom teeth, the appendix, the tail bone, body hair, and the semilunar fold in the corner of the eye.

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is an example of the same organ or bone that appears in different animals.

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change in the amount of different genotypes in a small population, owing to the disappearance of certain genes as individuals die or do not reproduce.

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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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Divergent - is the gathering of differences between groups which can lead to the formation of new species.
Parallel -  is the independent similar evolution traits, starting from a similar ancestors.
Convergent - is the process where organisms not closely related independently evolve similar traits as a result of having to adapt to similar environments.

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The exchange of genes between two separate populations. This usually happens when an animal or spore from a plant migrates to a new area.

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the changing of the structure of a gene, resulting in a variant form that may be passed down to later generations, caused by the alteration of single base units in DNA, or the removal, insertion, or rearrangement of larger sections of genes or chromosomes.

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the process in which organisms better adapted to their environment survive and produce more offspring.

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Variation
Inheritance
Selection
Time

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                          The Evolution of a Particular Animal

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                          The Evolution of a Particular Animal

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Snakes
What did snakes evolve from? Did they, or do they have legs, have they ever?
There is fossil evidence to say that snakes may have evolved from lizards that dig underground, like the varanids (or a group like it) during the Cretaceous Period. An early fossil snake relative, Najash rionegrina, was a two legged digging animal with a sacrum (bone in their back). Snakes do not have any shoulders, however they have the backbone that connects where the shoulders would be.
Snakes developed their lack of legs and dangerously sharp fangs over the course of 125 million years. A few other differences include their eye shape and their incredibly mobile skull. Another piece of evidence that snakes went through evolution is is the fact that their left lung is either gone or significantly smaller than the right lung. Some snakes have evolved to have flat tails, good for swimming; some, have began digging underground and using their no legs as an advantage. Also for burrowing purposes, snakes have evolved to have non external eyelids (so they wouldn't get scratched) and ears (so they could avoid getting dirt in their ears). Snakes have mutated so that their some fossil photos suggest that the snake used to appear close to the way a salamander would now, but, not a salamander.
The largest pre-evolution snake fossil was 49 feet long, implying that snakes used to be a lot bigger than they are today. There is no found information on why snakes began to get smaller, although scientists believe that it was due to there not being enough food for the animals being that large.
Two scientist suggest that the process of evolution in snakes that we had viewed previously was perhaps backwards? The evolution of snakes is not one in which there is an enormous amount of information.