To solve this problem, we need to identify which vertebrate group is characterized by having a crop and gizzard in its digestive system. Let's analyze each option:$\newline \bullet$Aves:$\newline$ - Birds, belonging to the class Aves, have a specialized digestive system that includes a crop and a gizzard.$\newline$ - The crop is a pouch-like structure used for storing food temporarily.$\newline$ - The gizzard is a muscular part of the stomach that grinds food, often with the help of ingested stones.$\newline$ - Therefore, Aves are characterized by having both a crop and a gizzard.$\newline \bullet$Reptilia:$\newline$ - Reptiles do not have a crop or a gizzard in their digestive system.$\newline \bullet$Amphibia:$\newline$ - Amphibians also lack a crop and gizzard in their digestive system.$\newline \bullet$Osteichthyes:$\newline$ - Bony fish, belonging to the class Osteichthyes, do not possess a crop or gizzard.$\newline$Based on the analysis, the vertebrate group characterized by having a crop and gizzard is Aves.$\newline$Therefore, the correct option is Option 1: Aves.