Resonance e hammer: o que têm em comum

1. Passo 1. Resonance — é utilizado em — Flauta. Resonance of the air column.
2. Passo 2. Flauta — é feito de — Osso. The oldest flutes (Hohle Fels) were carved from bird bone and ivory.
3. Passo 3. Osso — é material para — Needle. The first needles with an eye were carved from bone.
4. Passo 4. Needle — evoluiu de — Stone tool. Bone needles with an eye are part of the Palaeolithic toolkit.
5. Passo 5. Stone tool — evoluiu para — Hammer. The first hammer was a stone in the hand.

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