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the mammals share several characteristics, which distinguish them from all other classes of vertebrates. check all of the features that are found in mammals. - embryonic development often assisted by a placenta
- an anapsid skull
- hair used for insulation, camouflage or as sensory structures
- fused collarbones
- mammary glands



Answer :

The distinguishing characteristics of mammals are:

  1. embryonic development often assisted by a placenta.
  2. hair used for insulation, camouflage or as sensory structures.
  3. mammary glands.

Placenta is the organ formed after the fertilization of the egg in females. It consists of blood vessels from both the mother and the developing fetus. It is the organ that mediates the exchange of substances between the two. Food, oxygen and nutrients are provided and wastes are removed through it.

Mammary glands are present only in the mammalian females. These are present in the chest region and its primary function is to secrete milk for the newborn.

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