Respuesta :

The key morphological feature used to classify organisms as mammals is mammary glands.
Dejanras

The answer is: mammary glands.

Mammals are vertebrate animals constituting the class Mammalia and characterized by the presence of mammary glands.

Mammary gland is an exocrine gland that produces milk to feed young offspring.

For example, the mammary glands are arranged in the breasts.

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