Indicate the following changes that occur during metamorphosis in amphibians either as progressive or regressive or remodeling:

a) The development of middle ear in connection with the pharyngeal pouch.

b) The change in the shape of the mouth and the shortening and reduction of the cloacal tube.

c) Disappearance of lateral line organs of skin and reduction of blood vessels.

d) The differentiation of brain.

e) The changes in the portal system and the changes in the vascular system to supply blood to the lungs.

In the metamorphosis of amphibians, various changes occur as part of their transformation from aquatic larvae to terrestrial adults. These changes can be categorized as progressive, regressive, or remodeling, depending on whether they involve the development, reduction, or restructuring of specific traits or organs.

a) Development of Middle Ear in Connection with Pharyngeal Pouch: Progressive - During metamorphosis, the middle ear structures, including the tympanic membrane and the auditory ossicles, develop from ___ ________ ___ _____ __________ ______.
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