NEW YORK, June 19 — Scientists have long posited the earliest water animals to transition to land had amphibious tadpole features, going through a metamorphosis akin to that of...

Scientists have long posited the earliest water animals to transition to land had amphibious tadpole features, going through a metamorphosis akin to that of today's frogs.

NEW YORK, June 19 — Scientists have long posited the earliest water animals to transition to land had amphibious tadpole features, going through a metamorphosis akin to that of...