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Space Travel Water forms Earth 's oceans, lakes, and rivers, and is also present in the atmosphere All Earth's creatures rely on water to sustain life It comprises 90 percent of a human's body weight Water transports nutrients and electrolytes from one part of the body to another, and washes out wastes and toxins from the body Spacecraft Ecosystem Because of water's essential nature, the
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D, d [Called ‘dee’] The 4th LETTER of the Roman ALPHABET as used for English It originated in the triangular Phoenician symbol called daleth (akin to Hebrew dālāh, ‘door’), which was altered by the Greeks to form their delta (Δ), and later rounded to form Roman D Sound values In English, d normally represents the voiced alveolar plosive However: (1) The boundary between d and
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