Since it is a vertebrate with hair, it must be a mammal, a relatively recent arrival on the evolutionary scene compared with reptiles and amphibians. It is also a tetrapod, based on the image, which makes sense given that it is a mammal. The key derived characters which are evident from the image include: four limbs, jaws, hair, endothermy, milk production.
Work Step by Step
This question asks you to realize from the description and image that this is a mammal and to then review the chapter. Make lists of the various derived features which are found up to and in the mammals. The list in the answer could be expanded or could involve alternate sample items true for mammals.