In physics, radiation<span> is the emission or transmission of energy in the form of waves or particles through space or through a material medium. This includes: electromagnetic </span>radiation, such as radio waves, microwaves, visible light, x-rays, and gammaradiation<span> (γ)</span>
It is from the Edicaran Period
The question is unfortunately incomplete. The difference referred to here is that related to what s<span>cientists discovered between today's whales and the fossils of whales' ancient ancestors. The scientists discovered that the ancestors of whales had four legs and could walk on land. This commonality in body form between land animals and the ancestors of whales indicates a common ancestor. </span>
Human stem cells haven’t specialized in to create an organ. This means that they can be manipulated to create a variety of organs for organ transplant and therefore lowers the risk of rejection