Question

Fossils show how the complexity of living organisms has changed over time. Gerobatrachus hottoni was a unique organism that lived during the Permian period between ancient salamanders and ancient frogs. Scientists have nicknamed this organism the “frogamander” because it is believed to be a common ancestor of both modern frogs and salamanders.

A frogamander.

Which type of fossil is Gerobatrachus hottoni most likely to be?
intermediary
phylogenic
transitional
index

Answer 1

transitional

Gerobatrachus hottoni shows intermediate anatomical features between frogs and salamanders, so it's considered a transitional (intermediate) fossil linking those groups — not an index fossil.