Scientific papers ... remember (for example, as the first sentence of a paragraph) and then presenting evidence to support this statement. At the beginning of the Introduction section, the context ...

Manuscript file [including Methods, Figures and Extended Data if applicable] Cover letter Supplementary Information – optional; see details below. The Methods section should be written as ...

One’s tense will vary depending on what one is trying to convey within their paper or section of their paper. For example, the tense may change between the methods section and ... and background ...