Enteropeptidase (also called enterokinase) is an enzyme produced by cells of the duodenum and involved in human and animal digestion.
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The answer is grasses. Algae doesn't produce seeds or spores.
1) Carbon is removed from the air by photosynthesis in plants
2) Feeding, from animals, passes carbon along food chain/web
3) Carbon dioxide is released back into the air by:
-animals & plants respiring
-bacteria/fungi acting as decomposers
-Burning of fossil fuels (combustion)
Pic at the top is from my old biology book, incase u don't understand it still.
Hope I helped :)