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Hello, this chapter taught you all about how different species of populations are interacting with each other in their environment and also the role they're playing in their environment and how they're interacting with it.
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This question is revolving around chemical recycling and which option is playing the role of recycling inorganic matter back into the soil.
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So i think the best way to answer this question would be by going through each option and seeing which role they play.
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So the first one are your autotropes and they take in inorganic matter or inorganic nutrients and they produce, so these are your producers like your plants, organic matter that can then be used.
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B are your detritivores, and what they're doing is feeding on decomposing organic matter.
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C are your decomposers, and they break down organic matter and then release inorganic matter.
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And d are your tertiary consumers, and they feed on other animals...