Birds and reptiles are both vertebrates that lay eggs but birds have beaks and reptiles have teeth. occasionally birds have teeth but only in the embryonic stage. which conclusion is best supported by the presence of teeth in bird embryos?

micro/nanoscale topography surface exhibits many prominent properties and is extensively employed in biomedical device, microfluidic device and energy device fabrication. additionally, the clinical applications of biomaterials can be largely expanded with of nanostructured surfaces.

colors do exist. the color of the sky is actually violet; humans percieve the color of the sky as blue.