DUE TODAY, PLEASE HELP I'm having trouble with this gas laws assignment, my teacher assigned it yesterday, and my grade will drop if I don't finish, there are 4 questions

Ineed to find the answer of this question because i dont understand it

Which of these is not an example of chemical weathering? a. iron-rich mineral rusting b. feldspar turning into clay c. limestone reacting with acid d. granite breaking up into sand

Precision can be defined as the o exact center of a data set. o reproducibility of a measured value. o correlation between two variables that are measured in a data set agreement between a measured value and an accepted value.