What is the average adult body weight range for a rat?

The average adult body weight range for a rat typically falls between 250-450 grams. This weight range reflects the general size and physiology of commonly known rat species, such as the brown rat (Rattus norvegicus) and the black rat (Rattus rattus). Adult rats reach this weight due to their growth patterns and biological needs, making them larger than smaller rodent species, which is why other ranges provided as answer choices do not align with the average adult rat weight. For example, the 20-40 grams range is too low, as it is more representative of smaller rodents or young rats, while the 900-1200 grams range is excessively high, reflecting weights that may be associated with larger rodents such as feral guinea pigs. The 100-200 grams option is also below the expected adult weight for the more common rat species. Understanding these ranges is important for identifying typical weights in biological and veterinary studies, showcasing the physiological characteristics of rats in a home office context or other related fields.