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When studied birds were seen to be very similar to the structure of dinosaurs. All the dinosaur groups on this evogram, except the ornithischian dinosaurs, are theropods. Based on their shared features, scientists reasoned that perhaps the theropods were the ancestors of birds. When paleontologists built evolutionary trees to study the question, they were even more convinced. The birds are simply a twig on the dinosaurs' branch of the tree of life. As birds evolved from these theropod dinosaurs, many of their features were modified. However, it's important to remember that the animals were not "trying" to be birds in any sense. In fact, the more closely we look, the more obvious it is that the suite of features that characterize birds evolved through a complex series of steps and served different functions along the way. Take feathers for example, small theropods related to Compsognathus  probably evolved the first feathers. These short, hair-like feathers grew on their heads, necks, and bodies and provided insulation. The feathers seem to have had different color patterns as well, although whether these were for display, camouflage, species recognition, or another function is difficult to tell. There are many other similarities between birds and certain species of dinosaurs and raptors. These similarities make it almost crystal clear that birds could have easily come from this common ancestor

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https://www.youtube.com/watch?v=FQd9TXW5SXw

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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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A phrase made by Ernst Haeckel that refers to the development of an organism that describes all the intermediate forms of its ancestors throughout evolution

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A structure in humans that is very similar to corresponding structures or organs in ancestral animals.

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A common bone or organ found in an animal that can be traced back to a common ancestor having similar or the same structures

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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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A process of natural selection in which a species selects its partner based off of preference by one sex for certain characteristics in individuals of the other sex.

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The process in which two different organisms develop similar traits as a result of having to adapt to similar living conditions

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independent evolution  of similar traits coming from a certain ancestor with certain traits.

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When two or more species are tracked back to there common ancestors

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The transfer of genetic variation from one population to another

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The cause of change due to changes in form or nature

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This term refers to the process of where one organism survives in a certain environment compared to others and generates off spring

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V: Variation=mutation
I: Inheritance= DNA and sexual selection
S: Selection and genetic drift
T: Time=Migration\gene flow