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What are transitional fossils?

They are fossils of organisms that show characteristics between ancient and more modern forms.

They help explain how certain species evolved gradually.

They work as “clues” to the evolution of living beings.

What do they show?

These fossils reveal changes that happened slowly over millions of years.

They show how new characteristics appeared little by little.

For example:

body changes.

new adaptations.

transformations in bone structure.

Example: bird evolution

Transitional fossils help show the link between some dinosaurs and modern birds.

They indicate that certain groups of dinosaurs gradually developed:

hollow bones.

feathers.

flight-related characteristics.

This helps explain how modern birds originated.

Example: turtle evolution

Turtles are an important case studied through transitional fossils.

Their origin once seemed difficult to explain, but fossil discoveries helped reconstruct this process.

Early ancestors

The earliest turtle ancestors had:

wide ribs.

no complete shell.

They did not yet have the typical structure of modern turtles.

Pappochelys

Pappochelys represented an intermediate stage of evolution.

It had:

gastralia (belly ribs).

structures that would help form the plastron.

The plastron is the lower part of the shell.

Odontochelys

Odontochelys already had:

a developed plastron.

teeth.

This feature differentiates it from modern turtles, which do not have teeth.

Proganochelys

Proganochelys showed an important advancement.

It is where the carapace appeared:

the upper part of the shell on the back.

This development occurred about 214 million years ago.

What do these findings teach us?

Transitional fossils show that evolution happens slowly.

Species change gradually over time.

New characteristics appear in stages, until modern animals are formed.

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