Question

Mammals share several characteristics, which distinguish them from all other classes of vertebrmes. Check all of the features that one would use to clendy members into this class.

O three middle ear bones
O light, notow bones
O used for insulation, camouflage, or as sensory structures
O scales on legs and feet

Answer 1

The traits that categorize vertebrates as mammals include having three middle ear bones for enhanced hearing and possessing hair, which provides insulation, camouflage, and sensory functions. Scales on the limbs are not characteristic of mammals.

Step-by-step explanation:

Characteristics Unique to Mammals

Mammals, a class of endothermic vertebrates, are characterized by features distinct from other vertebrates. These features include three middle ear bones, also known as the malleus, incus, and stapes, which facilitate exceptional hearing abilities. Additionally, mammals possess hair which serves various functions such as insulation, camouflage, and acting as sensory structures like whiskers. In contrast to other vertebrates, mammals do not have scales on their limbs. Instead, these are replaced by hair or fur for added protection and thermal regulation. The primary role of hair is to provide insulation; however, it can also serve for camouflage or as a sensory mechanism through specialized hairs like vibrissae.

Among the options presented in the question, the ones that are indicative of mammals are 'three middle ear bones' and 'hair used for insulation, camouflage, or as sensory structures'. The mention of 'scales on legs and feet' does not correspond to mammalian traits, as this is a feature commonly found in reptiles and some other vertebrates.