Which is a valid statement about rock formation? a. igneous rocks all formed under circumstances that no longer occur on earth b. sedimentary rocks form today the same way that they formed in the past c. on one really known how metamorphic rocks form

B. sedimentary rocks form today the same way that they formed in the past.

the cell theory states that all living things including animals, as well as plants, are made of cells.

answer; i believe that the correct answer is(d) nondisjunction during meiosis;