(D) In the development of the alimentary canal,the $Stomodaeum$ (foregut) and $Proctodaeum$ (hindgut) are formed by the invagination of the ectoderm.

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(D) In the development of the alimentary canal,the $Stomodaeum$ (foregut) and $Proctodaeum$ (hindgut) are formed by the invagination of the ectoderm. In contrast,the $Mesodaeum$ (midgut) is derived from the endoderm. Therefore,both $Stomodaeum$ and $Proctodaeum$ originate from the ectoderm.