How many letters does the top answer for “relating to or concerned with the morphology of plants and animals” have?

The most common answer is morphologic (11 letters).

Crossword clue: relating to or concerned with the morphology of plants and animals

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

morphologic 11 letters wn-def

relating to or concerned with the morphology of plants and animals

morphological 13 letters wn-def

relating to or concerned with the morphology of plants and animals