Detrital sedimentary rocks are classified and named principally on the basis of

d. particle size

Detrital sedimentary rocks are rocks are particles that may have derived from physical weathering or chemical weathering. These are those whose material has been transported as solid particles but settled from a fluid, either water or air. They are classified on the basis of their size or grain, They are  also called clastic sedimentary rocks,  

answer they showed that organic molecules such as amino acids could be produced from inoragnic molecules;