Which of the following provides the best explanation of why birds have hollow bones? Hollow bones provide more structure for walking stability.
Hollow bones provide more structure for walking stability.

Hollow bones provide extra storage for food needed by birds in winter.
Hollow bones provide extra storage for food needed by birds in winter.

Hollow bones provide balance so birds can float when swimming in water.
Hollow bones provide balance so birds can float when swimming in water.

Hollow bones provide strength with less mass.
Hollow bones provide strength with less mass.
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