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aerobic respiration
Since energy is required, amount of mitochondria to carry out ________ and availability of oxygen is important.
diffusion
the process in which there is movement of a substance from an area of high concentration of that substance to an area of lower concentration
Active transport
the process where energy is used to move substances, across a cell membrane, from a region of lower concentration to a region of higher concentration, against concentration gradient.
Plasma membrane
________ or visking tubing are examples of partially permeable membranes that only allow allow some substances such as water, gases like oxygen and carbon dioxide to pass through freely but not some other substances.
Concentration gradient
the difference in concentration between two regions.
Active transport
The process which requires energy
Osmosis
the movement of water molecule from a region of high concentration to a region of lower concentration down the water potential gradient.
Note 
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