Comparative Anatomy Disection

Shaista Tejani and Serena Bharia

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Comparing the Rat and Pig

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What type of evidence for evolution did you discover through this dissection?

We observed an evidence of evolution today called homologous structures. We found that some of the animals shared the same structures due to common ancestry. The many similar organs and body functions proved that 2 different organisms evolved from a common ancestor. For example, the rat and pig have very similar anatomy which suggests they came from a common ancestor.

Using that evidence, which of the specimen that you observed are most closely related?

Out of the five animals we dissected, we found that the pig and the rat are most closely related. They both basically have the same internal organs to perform their everyday functions as we observed through the dissection. Some of these organs are the liver, stomach, diaphragm, heart, spleen, large intestine, small intestine, etc. We witnessed the similar anatomy between the two animals, and since homologous structures mean a common ancestor is involved, we concluded they would be related the closet, No other set of animals shared as many similarities as the rat and pig. Even though you probably wouldn't think these two animals are very similar apart from their four legs, through this dissection we learned that the interior tells a whole different story. The interior shows you the matching organs and organ systems of the two species.


The purpose of dissecting these five animals was to recognize the similarities and differences between their interior and exteriors. By comparing and contrasting these animals we found that while some of them may not look alike from the outside, they indeed are alike from the inside. We also discovered that the animals have different structures depending on their environment and adaptations they acquire to survive.