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Why are bacteria so difficult to classify at the species level?

Answer 1

Sebastian Alvarez

Due to unstability among the species.

The species of bacteria are not stable. They regularly try to adopt into changed environment by changing their genetic material.
So, it is not possible to easily and stable classification of the bacteria at the species level. We can temporarily classify bacteria below the genus. Thank you

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Answer 2

Maya Anderson

Bacteria are difficult to classify at the species level because they exhibit high levels of genetic diversity, lateral gene transfer, and horizontal gene transfer. Additionally, their phenotypic characteristics can be highly variable and may not always align with genetic relatedness, making it challenging to establish clear species boundaries.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.