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the difference between the concentrations of a specific molecule in two adjacent areas.
energy resources such as coal and oil, which are being used up much more quickly than they can...
an organelle that occurs in the cytoplasm of both plant and animal cells. It is made from stacks...
the form in which carbon dioxide is transported in red blood cells.
the gamete-producing phase that produces the zygote from which the sporophyte emerges.
structure in animal cells thought to form the spindle fibres during cell division.