Evidence of Evolution

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by Sidneymc
Last updated 4 years ago

Discipline:
Science
Subject:
Evolutionary Biology
Grade:
9

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Evidence of Evolution

The earth has been around for millions of years and is constantly changing with time. Layers of the earth hold fossils of past animals that lived on Earth. Studying the fossils and their location in the earth's layers gives us a timeline of the animal's changes, called a fossil record. By using relative dating, scientists can figure out when the adaptations took place, and how they helped the animal survive better in it's enviornment

Fossil Records

Dinosaur Fossil Record Mystery

Evidence of evolution is present in vertebrates to this day. Homologous structures are structures that have similar bone structure, and embryos. Most vertebrates have homologous structures, so this shows that they extend from a common ancestor, but their own species has evolved to suit it's own enviornment. An adaption that the species might have aquired is a vestigal organ, an organ that a species has, but doesn't have a use for. This provides evidence for evolution because the species has changed its body to survive better in it's conditions. Homologous structures have similar embryos. Many embryos in the early stages of devlopment look a lot alike, which proves that they have a common ancestor, but as the embryo matures, it shows how the species has changed.

Evidence of evolution is present in vertebrates to this day. Homologous structures are structures that have similar bone structure, and embryos. Most vertebrates have homologous structures, so this shows that they extend from a common ancestor, but their own species has evolved to suit it's own enviornment. An adaption that the species might have aquired is a vestigal organ, an organ that a species has, but doesn't have a use for. This provides evidence for evolution because the species has changed its body to survive better in it's conditions.

Natural & Artifical Selection

Anatomical Structures, Embryology & DNA

Suvival of the Fittest: Giraffes

On the other hand, their an analogous structures. Analogous structures are structures that look alike but are from different ancestors. This shows that even though they don't come from the same ancestor, they have evolved similarily to species with the same needs to survive in their enviornment. Many species are related through genetics. Phylogenetics is the study of the relationship of species through their macromolecules. It shows that organisms have a common relationship through their DNA, which it has evolved from to fit the species own needs.

Evidence of Evolution

Vestigial Structures

Geographic Distribution

All over the world, different species of animals exist, all slightly different from each other. Resreach has proved that all the continents used to be joined together in one super continent called Pangea. When all the continents spilt up, all the animals were separated. Then, the animals evolved and adapted to their new enviornments. Depending on where they lived, the animals devloped into different species that had variations that suited their location on the planet.

Geographic Distribution


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