Chordates Crossword

The first class of fish to appear in the fossil record
Small amphibians such as salamanders and frogs lack this vital organ as they rely on their skin to breathe
The only legless group of reptiles
Which member of the class Chonrichthyes has a cartilaginous skeleton and re-grows its teeth?
Least known amphibian class
This region of the brain is slightly larger in reptiles than in amphibians
These reptiles carry their young in their mouth
What is the largest bone in birds that helps them fly?
Egg-laying mammalian group
Sub phylum of marine chordates with similar characteristics to the ancestors of all vertebrates
Modern birds are a descendant of this species
Birds and mammals share this characteristic
Region of the brain unique to mammals
Which theory was inspired by observation of the finch?
Birds with short thick beaks are adapted to eat this food
Largest group of mammals which feed their fetus during gestation
The difference between vertebrate and invertebrate chordates
Flightless birds, such as the ostrich, belong to this group
The feeding method for both tunicates and lancelets
Crown group mammals evolved from earlier mammalian forms during this period