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This is the movement of particles from an area of high concentration to an area of low concentration.

The cell's chromosomes, attached to spindle fibres, align themselves on the metaphase plate in the middle of the cell.

The white blood cells detect the foreign antigens on the cells surface. They then rapidly produce antibodies which match the antigens and attach onto them. This allows other white blood cells to engulf th...

If the cancer is malignant, then the cancerous cells could spread via the bloodstream to the lung where a secondary tumor could develop. Lifestyle choices such as smoking that caused the breast cancer cou...

Eutrophication occurs when heavy rains cause fertalizers from farmland to flow into rivers or lakes. These fertalizers lead to a reduction to the limiting factors of algal growth by providing phosphate an...