Exposure to more radiation. Human made and from the sun.
Almost all the oxygen you breathe comes from green plants. They produce oxygen during a process called photosynthesis. During photosynthesis green plants manufacture the sugar moleculesfructose and glucose. Green plants use energy from sunlight to build sugarmolecules from carbon dioxide and
Answer:
RNA has great capability as a genetic molecule; it once had to carry on hereditary processes on its own. It now seems certain that RNA was the first molecule of heredity, so it evolved all the essential methods for storing and expressing genetic information before DNA came onto the scene.
Explanation:
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It would grow a certain amount before the top of the tree grew to heavy for the bottom and would topple over