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All nutrient cycles have once sequence:
1) Nutrient is taken up by producers as simple, inorganic molecules.
2) Producer incorporates nutrient into complex organic molecules.
3) When the producer is eaten, the nutrient passes into consumers.
4) Nutrient then passes onto secondary, tertiary or quaternary consumers.
5) When the producers and consumers die, their complex molecules are broken
down by decomposers that release the nutrient in its original simple form.
The Carbon Cycle
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Summary Questions p.90
1) The carbon dioxide concentration of the atmosphere is less on a
summers' day than on a winters' day because more plants are
photosynthesising in summer. This is because light is required for
photosynthesis, and more light is available in summer, therefore the
light dependent reaction can take place, providing ATP which transitions
to the light independent reaction. In the Calvin Cycle, ribulose
bisphosphate combines with atmospheric CO2 to create a 6-carbon