Answer:
Mammals come in different ways because they are mammals and breastfeed their creatures does not mean that they live in the same environment.
An example of this is the comparison between humans and whales, the big difference is their respiratory mechanism and this is why they live in different media.
Another cause of their differences is the body size that has a greater or lesser presentation, bone morphology or anatomical structure.
Another is the climate or the environment in which life developed, in very cold climates the mammals that tend to have more specialized plumage or more hair.
Explanation:
Mammals constitute a very diverse group of living beings and, despite the reduced number of species that form them compared to other taxa of the animal or plant kingdom, their study is by far the most profound in the field of Zoology, surely because the human species belongs to him.
Such is the diversity of the class that for a layman it would be difficult to establish clearly which species is a mammal and which is not. To illustrate this phenotypic, anatomo-physiological and ethological diversity with an example, it is enough to relate some of its species, such as the human being (Homo sapiens), a red kangaroo (Macropus rufus), a chinchilla (Chinchilla lanigera), a white whale (Delphinapterus leucas), a giraffe (Giraffa camelopardalis), a ring-tailed lemur (Lemur catta), a jaguar (Panthera onca) or bats ("Chiroptera").