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Osmosis

Osmosis is the movement of water across a partially permeable membrane. It requires no energy
from the cell and the movement of water molecules is random. The water moves from an area of
high water concentration to an area of low concentration, along the concentration gradient.



Active Transport

Sometimes…

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The breathing system's exchange surface is in the lungs, the lungs are in the thorax, inside the
ribcage just above the diaphragm, the diaphragm separates the lungs from the abdomen. As we
breathe in, the intercostal muscles contract, the diaphragm flattens out and the ribcage expands by
moving up and…

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Transpiration

The roots of the plant take up the water that the plants need. The water moves through the plant to
the leaves, where water evaporates from the leaf cells and diffuses out through the stomata. This
movement is the transpiration stream. The plant dehydrates when the rate of evaporation…

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