How many letters does the top answer for “the branch of ecology that studies ancient ecology” have?

The most common answer is palaeoecology (13 letters).

Crossword clue: the branch of ecology that studies ancient ecology

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

palaeoecology 13 letters wn-def

the branch of ecology that studies ancient ecology

paleoecology 12 letters wn-def

the branch of ecology that studies ancient ecology