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responsible, low impact, usually small- scale travel to protected, unspoilt, natural areas and educates visitors about the environment or particular area
the liquid produced by the kidneys consisting mainly of water and nitrogenous wastes such as...
the blood circuit from the heart to the lungs and back to the heart.
a lateral meristem in the vascular tissue of plants. The vascular cambium is the source of both...
a hormone produced by the adrenal glands which helps to maintain the balance of sodium in the...
breaking down of large nutrient molecules using chemical means (e.g. through the action of...