Which of the following is an example of biological weathering

Example of biological weathering may be the tree roots can grow into fractures in a rock and pry the rock apart, causing mechanical fracturing.

Biological weathering is the weakening and final breaking of rock by plants, animals and microbes. Growing plant roots can exert force or pressure on rocks like microbial activity breaks down rock minerals by changing the rock's chemical composition, thus making it more susceptible to weathering.  Tree roots inside rocks can be the example of this process.

answer; i believe the correct answer is ( a expression) plz check first.good luck