How many letters does the top answer for “the outer germ layer that develops into skin and nervous tissue” have?

The most common answer is ectoderm (8 letters).

Crossword clue: the outer germ layer that develops into skin and nervous tissue

2 answers found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

ectoderm 8 letters wn-def

the outer germ layer that develops into skin and nervous tissue

exoderm 7 letters wn-def

the outer germ layer that develops into skin and nervous tissue