Hydrogenotrophy is Choose one: A. the oxidation of water during photosynthesis to liberate electrons, protons, and oxygen gas. B. the use of hydrogen gas as an electron donor. C. an award given to fuel companies that have the most fuel-efficient vehicles. D. the generation of hydrogen gas by methanogens in syntrophy.

answer; i believe the answer is hydraulic action;

answer: b: experiments that showed that all cells are similar in how they metabolize and in their composition

explanation:

igneous rocks which formed by the crystallization of magma at the surface of the earth called extrusive rocks. they are characterized by fine-grained textures because the rapid cooling at or near the surface did not provide enough time for large crystals to grow.

the correct answer to this question is #5