The 500 Million Year History of Vertebrates

Cladogram showing the common ancestor of all tetrapods.

Created with CAST's UDL Book Builder
CAST would like to thank Texthelp Inc. for use of the SpeechStream toolbar

What does this cladogram show as the major difference between fish and frogs?

Listen

Think about the group that frogs belong to that fish do not belong to.

Listen

The main difference between frogs and fish on this cladogram is that frogs are tetrapods, which means that they have four limbs. Fish do not have four limbs, and they are not tetrapods.

Listen

Select this then click anywhere in the book to start reading text Speak the current selection Stops speech playback Double-click a word in the book and click this icon to translate the word into Spanish