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Odontochelys semitestacea
Blaine and Sam Hour 2

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https://docs.google.com/a/sunprairieschools.org/spreadsheets/d/1qrx0gxIpzpGpg-SPsNS5mmlQMUtuDZC7eOSDBgo9rjI/edit?usp=sharing

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The structures of the three animals show how evolution plays a role on physical structures of animals making them more suited for their environment. The earth layers show relative dating because we know that the lower a fossil is in the earth layers the older it is.

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We can  use embryology, evolutionary  trees, and DNA comparisons to prove that an animal such as the Odontochelys is related to organisms on earth today.
Embryology can show us similarities between organisms. The development of a tortoise is very similar to what we can assume the development of the Odontochelys would be. The tails of the two animals are similar in length (about 5 inches) after birth.
We can use evolutionary trees to show similarities between prehistoric animals and animals on earth today. The Piranha is very similar to the Odontochelys because it has 5 traits alike with the Piranha. Whereas animals like a House Cat has only 3 traits similar so it is not as closely related
We can use the DNA strands to show similarities between prehistoric animals and animals on earth today. The Piranha is very similar to the Odontochelys because there is a 97% similarity between the DNA of the fossil and the current day Piranha. The Alligator and the Insect have below 90% similarity.
Embryology shows hows prehistoric animals are similar to current day animals because with the development of the animals being similar to the same, they likely have the same genes for how the animal is to develop.
The Evolutionary Tree shows how prehistoric animals are related to current day animals because it helps show how certain traits are passed on through evolution and where the splits (where animals become different). The traits all add up to make up what the animals are.
The DNA is the most correct when it comes to showing how prehistoric animals are related to current day animals because the closer the DNA is to the two animals explains how the animal is to develop as well as grow throughout their life. The only way the DNA can be faulty is with gene expression and if the genes are turned on or off.

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The Odontochelys is not as closely related to an insect as it is to the Piranha from the zoo. The only real thing it has in common with the insect is that it has Bilateral Symmetry. But it has all traits similar to the Piranha on the tree.

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In the tortoise, the tail develops early on in the stages of development, and maintains throughout development of the organism. In the odontochelys the tail develops throughout development much like the tortoise. Both organisms’ tails develop to 3-6 inches long.

The Manx gene is expressed in both organisms allowing for the tail growth in a similar fashion.