The question asks us to identify the vertebrate group of animals characterized by the presence of a crop and a gizzard in their digestive system. Let's analyze each of the given options:
Based on the above analysis, the correct group characterized by the presence of a crop and gizzard is Aves.
Therefore, the correct answer is:
| Pair of skeletal parts | Category | |
|---|---|---|
| (a)$\,\,$ | Sternum and ribs$\,\,$ | Axial skeleton |
| (b)$\,\,$ | Clavicle and glenoid cavity$\,\,$ | Pelvic girdle |
| (c)$\,\,$ | Flumerus and ulna$\,\,$ | Appendicular skeleton |
| (d)$\,\,$ | Malleus and stapes$\,\,$ | Ear ossicles |