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- What is mechanicaldigestion? In molluscs,arthropods, earthworms, birdsand vertebrates, in general,which organs respectivelyparticipate in this type ofdigestion?What is the function of thevitellus in the vertebrate egg?How are these eggs classifiedaccording to the amount ofvitellus within them?How are the specific cell types patterned correctly? How does the flatwormtell the posterior blastema to become tail and the anterior blastema to become head?