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The most reliable source among the options provided would be **an article from a scientific journal**. Scientific journals typically undergo a rigorous peer-review process, ensuring that the research presented is credible, well-researched, and based on current scientific standards.
In contrast, the other options (a biology textbook from 1920, an opinion column in a magazine, and a blog written by an anonymous author) are less reliable due to potential outdated information or lack of rigorous validation.