Why do medical tests happen on rats before they happen on humans? What biological link do we have to rats?

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Anonymous 0 Comments

In addition to what others have said, primates and rodents are also the two lineages that are closer related to each other than the other famous mammal lineages like carnivora, ungulates, etc. are to primates. Both are [Euarchontoglires](https://en.wikipedia.org/wiki/Euarchontoglires).

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