instruction:
You will be given a trivia clue, and the category it belongs to. You should answer with the best answer that belongs in the category and is described by the clue. For simplicity, answers should be in all lower cased letters.
question:
Category: CARTS, WAGONS & SLEDS 
Clue: Used to transport small loads like lawn dirt, it's a cart with 1 tire & a shallow body, held & pushed by handles
answer:
a wheelbarrow


question:
Category: "D" IN SCIENCE 
Clue: Sharks first inhabited the waters during this period of the Paleozoic era named for an English county
answer:
devonian


question:
Category: THE ARABIAN HORSE 
Clue: The Arabian is a smaller breed than most, having 23 of these, unlike the usual 24 for other horses
answer:

vertebrae