The _______________ of a feather is a structure that typically emerges from the skin. 

Which of the following is not true of jawless fishes? 

The following animal is in what class?   

Extant members of class Sarcopterygii are characterized by 

Freshwater Actinopterygii live in a ________________ environment and thus tend to _____________ water across their gills. 

Which of the following is false about birds ?

Lungfish eggs are externally fertilized and develop outside of the parental body. This is an example of 

The following organism is a member of what class? 

The following is a member of what class? 

All chordates share which of the following features?