Examlex
Which technique of making tools involves the preparation of a striking platform at one end of a specially prepared core,after which three or four long,triangular flakes are detached,leaving a nodule shaped like a tortoise shell?
Gill Slits
Openings found in the pharynx of fish and some amphibians that are used for respiration and water filtration.
Cartilaginous Fishes
Fish that have skeletons made entirely of cartilage, such as sharks and rays.
Bony Fishes
Fish that have skeletons primarily made of bone, as opposed to cartilaginous fishes, which have skeletons made of cartilage.
Keel Of The Sternum
The central ridge or projection on the sternum (breastbone) that resembles the keel of a boat, more prominent in some animals like birds for attachment of flight muscles.
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