since there aren't any answer choices, here is what i personally think.
the social responsibilities of scientists. right now, much of the emphasis in science is on the professional responsibility of scientists to stick to "standards agreed upon by the scientific community" regarding how research should be conducted, frankel said. he called these responsibilities "internal."
i don't know if i completely understand the question, but i believe the answer would be a. hydrogen gas because the others are compounds that, although may form naturally, aren't pure to begin with. i'm sorry if i'm incorrect. i haven't heard this question worded this way.
what type of lipid is shown?