by Professor W. S. Bullough.
The two groups of fishes illustrated in today's programme are the cartilaginous fishes-sharks, skates and rays-and the bony fishes whose skeletons contain bone in addition to a certain amount of cartilage.
(to 10.25)
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by Professor W. S. Bullough.
The two groups of fishes illustrated in today's programme are the cartilaginous fishes-sharks, skates and rays-and the bony fishes whose skeletons contain bone in addition to a certain amount of cartilage.
(to 10.25)