Sentence examples for this is puzzling because from inspiring English sources

This is puzzling because glycolysis is far less efficient at creating ATP.

This is puzzling because it limits the number of offspring they can produce.

This is puzzling because the origin of a species is usually also the source of greatest genetic diversity.

This is puzzling, because while the software helps certain users, it creates disutility for others (especially expert users and early adopters of Internet service).

This is puzzling, because the later period sees a rising inflation, indicating, a priori, that there should be deterioration in the income distribution levels.

This is puzzling because, in all other cases, either the GLUT4 NFκB ratio or dioxin levels showed straightforward relationships to other parameters analyzed.

(This was puzzling, because as my newly single Uber driver had informed me the night before, "Everyone on Tinder in Park City lists two interests: the outdoors and sushi").

This was puzzling because cell growth would be arrested upon ND.

This was puzzling because MBP, DEHP, and MEHP are all known to have endocrine-disrupting effects on male development (Scott et al. 2009).

This, again, is puzzling because it has been years since anyone bothered to write opinion pieces about Qatar in the U.S. media.

Aside from the implication that a polyQ expansion is not necessary for pathology, this observation is puzzling because polyQ AR is associated with loss of AR function, whereas overexpression of WT AR would be expected to increase AR signaling.