'D' Science Quiz

Can you name the 'D' Science answers?

Body Parts
Principal muscle of respiration 
First part of the small intestine 
Inner layer of skin 
Bone-like material inside teeth 
Triangular shoulder muscle 
Small depression in the cheek 
Element: Db 
Element: Dy 
Element: Ds 
Mixed Bag
Extinct reptile e.g. Velociraptor 
Hardest Mohs scale material 
The D part of DNA 
Compactness of a substance 
Unit used to measure sound 
Tree that annually loses leaves 
Basic mathematical operation (÷) 
Any numeral from 0 to 9 
Longest chord in a circle 
Pertaining to tenths or number 10 
Ten-sided polygon 
Charles: Theory of evolution 
John: atomic theory 
Humphry: potassium and sodium 
René: analytical geometry 
Louis: father of photography 
Aquatic mammal: Cetacea 
Ruminant mammal: family Cervidae 
Wild Australian dog: Canis lupus 
Extinct bird: Raphus cucullatus 
Horse family: Equus africanus 

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