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Actually ur question is itself not correct so the 'WHY" part cannot be answered.

Epithelial tissue is a lining tissue which can be present in any organ.the mesoderm gives rise to organs like-muscles / bones / connective tissue / blood and lymph vessels / kidney / gonads and the cortex of suprarenal glands.

ectoderm-nervous system epidermis and so on and

endodermto GIT liver lungs pancreas and GIT

so for example if u consider the epithelial tissue of lungs----its derived from endodermas lung as a whole is derived from endoderm.

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Q: Why is the epithelium derived from ectoderm mesoderm endoderm and connective tissue mesoderm only?
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