The true statement among the options provided is:
Composting speeds up the decomposition of organic material.
Here's a brief explanation of why the other statements are not true:
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Insects can delay the decomposition process. This is misleading; while insects may slow down decomposition under certain conditions, they typically aid in the process by breaking down organic matter and contributing to the ecosystem.
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Organic material will not decompose without the help of composting. This is incorrect because organic material can decompose naturally through natural processes, even without human intervention or composting.
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Decomposition only involves microorganisms like bacteria. This is false, as decomposition is a process that can involve a variety of organisms, including fungi, insects, and larger scavengers, in addition to bacteria.
Therefore, the statement regarding composting is the correct answer.