Examine sample Z.There are two prominent sedimentary structures to be seen in these samples. One are the empty cylindrical tubes. These are ancient animal burrows. Identify the other primary sedimentary structure.(Consult the figures in the above PDF for examples/reference.)Group of answer choicesraindrop impressionsgraded bed(s)current ripple marks (also called "asymmetrical ripple marks")cross-beddingbimodal cross-beddingwave ripple marks (also called "symmetrical ripple marks" or "oscillation ripple marks")mudcrack(s) (also called dessication cracks)salt cast(s) (preserved cubic shapes of halite crystals, now formed from sedimentary rock)flute(s)flute cast(s)fossil plant roots (trace fossils)animal burrows (trace fossils)animal tracks, trackways, and trails (trace fossils)body fossils (once-living tissue or skeletal material)Flag this Question