Feathers!
Feathers - the only outwardly obvious characteristic unique to birds.
The physical characteristic of a wasp that distinguishes it from other insects is its slender or skinny body shape.
The physical characteristic that distinguishes a spider with a fat body from other spiders is its larger and rounder abdomen.
A.) warm bloodB.) hard boneC.) hairD.) liver
One unique characteristic distinguishing animals from members of other kingdoms is animals have more complex and rapid movements. The movement of sponges isn't more complex.
Birds have hollow bones. (Except for penguins, which now have solid bones to help them dive)
hair
The unique characteristic that distinguishes a spider with a white back from other spider species is its distinct coloration, specifically the white color on its back that sets it apart from other spiders.
The presence of segmented bodies with jointed appendages is the characteristic that most distinguishes arthropods from other invertebrates. This feature allows arthropods to exhibit a wide range of movement and adaptability in their environments.
The presence of vertebrae is typically found in the Animalia kingdom, specifically in the subphylum Vertebrata, which includes animals with a segmented vertebral column. This characteristic distinguishes vertebrates from other animals in the animal kingdom.
The presence of a cell wall made of peptidoglycan in eubacteria and a lack of peptidoglycan in archaebacteria distinguishes them from members of the other four kingdoms.
absence of a cellular nucleus