Explain two examples of mechanical weathering

If anyone would be able to me out with these three questions it would be these are from the chem 2202 course.

Which compounds are the brønsted-lowry bases in this equilibrium: hc2o4– + h2bo3– h3bo3 + c2o42– ? a. h2bo3– and h3bo3 b. hc2o4– and h3bo3 c. hc2o4– and c2o42– d. h2bo3– and c2o42– e. hc2o4– and h2bo3–

Select the correct answer from each drop-down menu. in the process of nuclear fission, . fission only happens to very atoms. the fission process usually also produces several free .