No. The actual professional activity, citizenship, credentials and employment arrangement need assessment. The travel pattern alone does not decide the category.
Describe the work before the itinerary
Hypothetically, recurring visits could involve different duties. Identify what is actually proposed rather than treating every trip as the same permitted activity.
TN requires prearranged professional employment with an employer in the United States, in a profession USMCA Appendix 2 names, held by a Canadian or Mexican citizen with the qualification that entry specifies. An adjudicator compares described activity with the listed profession, not with an internal title, and a position that fills four days a week with fleet and personnel work will not become professional because a fifth day includes fieldwork. A move that shifts the work toward tasks outside the listed profession, or toward duties that are no longer professional in nature, is a substantive issue and should be reviewed before anyone relies on the existing file. Where biology is clearly the core and the adjacent work supports it, the match is easier to present; where biology is a minority function inside a primarily different discipline, the position may not fit the category however strong the applicant's background.