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water that falls to earth in any form, such as rain, snow, hail and sleet.
a clear, colourless solution of hydrogen chloride (HCl) in water. It is a strong and highly...
a blood vessel that returns oxygenated blood from the lungs to the left atrium of the heart.
the series of activities that takes place in a cell leading to its division and duplication (...
a plant body consisting of one or more cells. It is not differentiated into root, stem and...
vascular tissue that conducts food substances from the leaves to other parts of the plant. The...