Sisal fiber board e hammer: o que têm em comum

1. Passo 1. Sisal fiber board — faz parte de — Dardos. Compressed fibre that holds the darts.
2. Passo 2. Dardos — evoluiu de — Arco e flecha. Accuracy of shooting.
3. Passo 3. Arco e flecha — é feito de — Sílex. Arrowheads were knapped from flint.
4. Passo 4. Sílex — é material para — Stone tool. Tools were knapped from flint and other rocks with a sharp fracture.
5. Passo 5. Stone tool — evoluiu para — Hammer. The first hammer was a stone in the hand.

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