According to paragraph 6, what evidence supports the theory that undersea hydrothermal vents are a possible location for the origin of life? A. Undersea hydrothermal vents probably were much colder during the period of the early Earth than they are observed to be today. B. The fact that materials with the kind of chemical composition from which organic molecules can be produced are in undersea hydrothermal vents. C. Located on the ridge axis, complex organic materials are more stable. D. They are located directly on the ridge axis, near-freezing surface environments.