Given a scientific passage and an answer, generate a question for the given answer.

Passage: Electronegativity is a qualitative measure of how much an atom attracts electrons in a covalent bond. Answer: electrons
Electronegativity is a qualitative measure of how much an atom attracts what in a covalent bond?

Passage: Glutathione is a low-molecular-weight compound found in living cells that is produced naturally by the liver. Healthcare providers give glutathione intravenously to prevent side effects of chemotherapy and to prevent kidney problems. Answer: liver
Glutathione is a low-molecular-weight compound found in living cells that is produced naturally by what?

Passage: The biosphere includes all living things within all of their environments. It includes every part of the environment where life exists, from the upper reaches of the atmosphere to the top few meters of soil, to the bottoms of the oceans. An ecosystem is made up of the relationships among smaller groups of organisms with each other, and with their environment. Scientists often speak of the interrelatedness of living things, because, according to evolutionary theory, organisms adapt to their environment, and they must also adapt to other organisms in that environment. Answer: biosphere
What includes all living things within all their environments, including everywhere life exists, from the upper atmosphere, to the top of the soil, to ocean bottoms?