Birds have hollow bones due to the fact thay need to be as light as possible for their wings to generate enough lift for them to fly
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<h3>The continuous process by which carbon is exchanged between organisms and the environment. Carbon dioxide is absorbed from the atmosphere by plants and algae and converted to carbohydrates by photosynthesis. ... The carbon cycle is thought to be the source of significant amounts of energy in the Sun and other stars</h3>
