What are the 11 major organ systems?

What are the functions of the integument system?

What are some differentiated structures?

What do keratinised structures do?

All true vertebrates have a multilayered epithelium, what do fish / amphibians have?

What is the structure of mammal integument?

What is the structure of scales?

What is the structure of beaks?

What is the structure of beaks / claws?

What is the structure of feathers?

What is the structure of hair?

What is the structure of glands?

What is the structure of nails?

What is the structure of hooves?

What is the structure of horns?

What is the structure of baleen?