What organic compound comprises the membrane that surrounds and defines a cell? amino acid false nucleic acid false sterol false phospholipid true Single The chemosynthesis reactions that occur and provide energy to organisms at the bottom of the ocean are powered by what energy source? The electricity carried by salt ions in seawater false The small amount of light from the sun that reaches the seafloor false The waste products of organisms dwelling at the upper parts of the sea false The heat flowing from hydrothermal vents true Single This is the temperature and pressure condition at which water can coexist simultaneously as a solid, liquid, and gas. Critical point false Crucial point false Triple Point true Goldilocks Point false Single Which of the following celestial bodies is "geologically dead"? Mercury true Io false Titan false Pluto false Single Cyanobacteria can produce their own food through photosynthesis. What is this food called? Oxygen false Carbon dioxide false Sucrose false Glucose true Single Which of the following celestial bodies has been discovered to be abundant in organic compounds? Venus false Mars false Europa false Titan true Single Which of the following celestial bodies has a thick atmosphere? Mercury false Europa false Titan true Charon false Single A system where energy is exchanged with the surroundings but not matter is called? Open system false Closed system true Isolated system false System at thermal equilibrium false Single What is the process that enables the transport of energy and matter between and within Earth's subsystems? Milankovitch cycles false Biogeochemical cycles true Wilson Cycles false Davis Cycles false Single The dating of what material helped determine the age of the Solar System? meteorites true solar wind false Kuiper belt samples false near-Earth asteroids false Single