<prompt> Skin with all its appendages is known as:Pilosebaceous unitIntegumentary systemReactive unitMalpighian system  <response>: Skin with all of its appendages is known as Integumentary system. It protects the body from external damage, loss of water etc. It includes hair and nails as well.in case of animalsbirdsreptiles- includes scales, feathers, hooves as well 