Biology
- Essential (biology), part of an organism is a part which the organism cannot live or reproduce without
- Essential amino acid, one that the organism cannot produce by itself
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Famous quotes containing the word biology:
“The “control of nature” is a phrase conceived in arrogance, born of the Neanderthal age of biology and the convenience of man.”
—Rachel Carson (1907–1964)
“Nothing can be more incorrect than the assumption one sometimes meets with, that physics has one method, chemistry another, and biology a third.”
—Thomas Henry Huxley (1825–95)