What role does the isthmus region play in egg development?

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Production of the egg's protective cuticleCreation of the eggshell membraneSecretion of the egg white (albumen)Process of fertilizing the eggNone of the above

Explanation

The isthmus is responsible for forming the eggshell membranes, which are essential layers between the egg white and the shell. It does not contribute to cuticle formation, albumen secretion, or fertilization.