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Hail falls only from cirrus clouds.
Charles Darwin
A 19th-century naturalist best known for his contributions to the science of evolution, especially his theory of natural selection.
Evolution
The method through which various types of life forms are believed to have evolved and branched out from ancestral species over Earth's history.
Animal Learning
The process by which animals acquire new behaviors or information through experience, which can include conditioning, imitation, and problem-solving.
Human Thought Processes
The mental activities involved in understanding, processing, and conveying information, including perception, memory, judgment, and reasoning.
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