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This video explains about coefficient, constant, variable and exponents. Useful for introductions to the topic and/or extension work. 

Introduction to passive and active transport

Osmosis is the movement of water across a semi-permeable membrane from an area of low solute concentration to an area of high solute concentration. Osmosis helps regulate the flow of water in and out of cells, which is crucial to their function.

This online tutorial will provide you with some guidelines on how to interpret both topographic and geologic maps.