Answer: All of the above
Notes: Biological weathering is a natural phenomenon where the rocks are broken down by living organisms. This process is multifaceted and can be induced by animal burrowing and human activities that disrupt the ground surface. Additionally, plant roots can also contribute to biological weathering, as they expand in search of moisture and nutrients, leading to the breakage of rocks. Each method plays a significant part in the process, making all of them correct answers. Thus, the correct answer is 'All of the above'.
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