<span>Most organisms, including humans, can't use the free gaseous form of nitrogen found in the air. We need other organisms and natural processes to "fix" nitrogen into a solid form that plants and animals can use. Most of the nitrogen that plants and animals use is made by bacteria.</span>
The rate at which materials enter and leave the cell depends on the cells surface area
Your answer is: D) surface area
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The correct answer would be “B”
