Bird skeletons are very delicate, and therefore, difficult to be preserved. The bones of the birds are soft. The small animals are very prone to physicochemical as well as biological decay. This is why the fossil record of bird is incomplete and well-preserved fossils of birds are rare to find, except at a few unusual sites.
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I'm not sure but look online for the answers
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the addition of solutes lowers the potential, while an increase in pressure increases the potential.
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Radioactivity due to heavy elements
Friction caused by earths fast rotation
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The anus is an opening at the far-end of the digestive tract and is the exit point for the waste material.
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