1-Direction:Identify the following changes in material if it is useful or harmful. 31. Cutting of piece of cloth to made into hankerchief. 32. Changing wood into charcoal for cooking, 33. Burning of old tree 34. Throwing kerosene into the river. 35. Cutting of wood into chair. 36 Burning of garbage. 37. Cutting down trees. 38. Old tires into pots. 39. Burning of plastci cups 40 Changing candy wrappers into flower vase.

pahelp naman po need ko na bukas
pa ayus naman po ang ans.
nonsense report ​