what are theories on the origin of life?
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Life began at deep-sea vents The deep-sea vent theory suggests that life may have begun at submarine hydrothermal vents spewing key hydrogen-rich molecules. Their rocky nooks could then have concentrated these molecules together and provided mineral catalysts for critical reactions.
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Based on what we know about life on Earth, the only place we know life exists for sure, we can determine at least 3 major requirements: Energy. Warmth to allow liquid water to exist (or liquid methane?) ... UV light can damage or break complex molecules, causing mutations that may inhibit the emergence of complex life.
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The evolutionary history of life on Earth traces the processes by which living and fossil organisms evolved, from the earliest emergence of life to the present. ... The similarities among all known present-day species indicate that they have diverged through the process of evolution from a common ancestor.
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One theory is that RNA, a close relative of DNA, was the first genetic molecule to arise around 4 billion years ago, but in a primitive form that later evolved into the RNA and DNA molecules that we have in life today. ... RNA is created from DNA to put that information into action.
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The three scientists that contributed to the development of cell theory are Matthias Schleiden, Theodor Schwann, and Rudolf Virchow. A component of the cell theory is that all living things are composed of one or more cells. A component of the cell theory is that the cell is the basic unit of life.
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Why is a reducing atmosphere conducive to the origin of life? It is more favorable for the development of organic molecules. Which eon would contain rocks with no fossils?
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["It's just a theory. ... ", 'Humans are descended from monkeys. ... ', 'Natural selection is purposeful. ... ', "Evolution can't explain complex organs. ... ", 'Religion is incompatible with evolution.']
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The cell theory states that all living things are composed of cells. It also says that cells are the basic units of structure and function in living things and new cells come from existing cells.
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['All living organisms are composed of one or more cells.', 'The cell is the basic unit of structure and organization in organisms.', 'Cells arise from pre-existing cells.']
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['planets.', 'stars.', 'galaxies.', 'cosmology (the origin of the universe).']
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['the birth of our solar system began as dust and gases (nebula) started to gravitationally collapse.', 'the nebula contracted into a rotating disk that was heated by the conversion of gravitational energy into thermal energy.']
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The first piece of evidence that needed to be found to support the endosymbiotic hypothesis was whether or not mitochondria and chloroplasts have their own DNA and if this DNA is similar to bacterial DNA. This was later proven to be true for DNA, RNA, ribosomes, chlorophyll (for chloroplasts), and protein synthesis.
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['All living things are composed of cells.', 'Cells are the basic units of structure and function for living things.', 'All cells come from pre-existing cells. Also, organisms grow by “adding on more cells” NOT by increasing the size of their cells.']
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['Reproduction. Must be able to reproduce. ... ', 'Cells. Made up of cells. ... ', 'Energy. Must be able to maintain and produce energy. ... ', 'Response to the environment. Respond to their environment. ... ', 'Homeostasis. Must be able to maintain Homeostasis. ... ', 'Development and Growth. ... ', 'Change over time (evolution) ... ', 'Chemicals of Life.']
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['Cellular Orginization. All life forms are composed for one or more cells.', 'Reproduction. All living things produce young; more of their own species.', 'Metabolism. All living things obtain and use energy.', 'Homeostasis. ... ', 'Hereditary. ... ', 'Respond to enviorment. ... ', 'Growth and development. ... ', 'Evolution.']
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These three examples are; DNA, proteins and lipids from hydrogen cyanide, hydrogen sulphide and ultraviolet light. Their results reveals that the basic components for biological molecules could have all occurred simultaneously in primordial ponds and streams, coming together to form the first cells.
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The unified cell theory states that: all living things are composed of one or more cells; the cell is the basic unit of life; and new cells arise from existing cells. Rudolf Virchow later made important contributions to this theory.