Question

Derivation of ecto, meso, endoderm in an embryo​

Answer 1

Explanation:

word-forming element generally meaning "outside, external," before vowels ect-, from Latinized form of Greek adverb ektos "outside, out of; free from; exempt" (opposed to entos), used to form compounds in Greek (such as ektomē "a cutting out"); related to Greek ek, ex "out," from PIE *eghs "out" .