Where do the carbon-containing molecules in the giant kelp come from? where do they go? be sure to answer and provide evidence for both questions. plzz this is

Carbon enters the Giant Kelp as carbon dioxide.
The carbon dioxide is taken into the Giant Kelp and incorporated into its sugar molecules during the process of photosynthesis.
The carbon in the sugar molecule is either used during the process of cellular respiration and then released into the water as carbon dioxide or it becomes incorporated into the kelp itself.

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