Heat-sealed seams e rocket: o que têm em comum

1. Passo 1. Heat-sealed seams — faz parte de — Plastic bag. Heat-sealing of the bottom and sides.
2. Passo 2. Plastic bag — evoluiu de — Paper bag. A replacement for paper.
3. Passo 3. Paper bag — é feito de — Paper. Paper.
4. Passo 4. Paper — é material para — Rocket. The first rockets were paper tubes filled with gunpowder.

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