Answer:
specimens B is the right answer
I think that the correct order of impacts would be first a, then z, then b because the radial cracks at a were cut off by the cracks at z and the cracks at z are cut off by the cracks at b so in other words I think that when radial cracks are cut off by another series of cracks, the other series of cracks postdates the first set of cracks (impact)
2. enzyme
3. esophagus
4. lower esophageal sphincter (LES)
5. throat (pharynx)
6. stomach
7. stomach
8. protein
9. HCL
10. small intestine
11. chemical
12. nutrient
13. cells
15. bacteria
16. anus
17. solid