The correct answer is e.
1. is correct. Many repeated studies continue to show that there are primary anaerobic bacteria cultivated from root canals spaces
2. is wrong. The study showed a similarity in bacteria isolated from root canals to those isolated from the sulcus of a periodontal pocket. It is believed from this study that the sulcus is the source of bacteria in root canals infections
3. is correct
4. is correct5.is wrong. Strict anaerobes are predominant in the initial infections of root canals.

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