Birds get thmst (forward motion) rind lift (upward motion) from
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Birds get thrust and lift from
1) air sacs
2) flapping of wings
3) twisting of feathers
4) shape of wings which is similar to the aeroplane blades
1) air sacs
2) flapping of wings
3) twisting of feathers
4) shape of wings which is similar to the aeroplane blades
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