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Osmosis is defined as the movement of water from an area of high water potential to an area of lower water potential, across a partially permeable membrane. This means that water molecules moves from a ve...
They act as energy centres for a cell and provide a cell with energy needed to function.
Carbon is removed from the air by plants during Photosynthesis as they need this to make energy. Oppositely, respiration takes in O2 and releases CO2 to the atmosphere. CO2 is also released in to the atmo...
One cell thick - short diffusion distanceLarge surface area to volume ratio - enables efficient diffusionGood ventilation of air in alveoli - enables constant concentration gradientGood capillary blood su...
Infections can be caused by a variety of different microorganisms. Amongst them, pathogenic viruses can cause a range of different condition, such as the common cold (the flu virus) and the HIV virus. Vir...
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