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447

Centuries: 4th century - 5th century - 6th century

Decades: 390s 400s 410s 420s 430s - 440s - 450s 460s 470s 480s 490s

Years: 442 443 444 445 446 - 447 - 448 449 450 451 452


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Homeostasis

... the internal environment within tolerable limits. With regard to any parameter, an organism may be a conformer or a regulator. Regulators try to maintain the parameter ...