1. Fossils, scientist study fossils and compare them with other animals. Some animals do not become a fossil so the fossil record is not complete.
2. (Homologous structures) Between billions to millions to thousands of years animals change a lot in that period of time. Scientist study and compare them so can see what they were like.
3. DNA- It is cool to find a DNA sample of your own kind. An example is like when you give blood it has parts of your DNA in it.
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