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The fresh remains of an unknown vertebrate were discovered in the Amazon Basin. To help determine the vertebrate’s possible relation to other animals, scientists compared the external structure of its digestive organs to that of other vertebrates. This procedure is typical of work done in the field of comparative

1. cytology 2. anatomy 3. embryology 4. biochemistry

Edit: it was anatomy, I got it right

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Answer:

The correct answer is option 2. "anatomy".

Explanation:

Comparative anatomy is defined as a type of study that compares the body structures of different species of animals, looking for similarities that help to understand the evolutionary biology of novel species. In this example a study of comparative anatomy was performed to characterize an unknown vertebrate of the Amazon Basin by comparing the external structure of its digestive organs with the ones of other vertebrates.

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