<span>They are organelle, cells, tissues, organs, organ systems, organisms, populations, communities, ecosystem, and biosphere.</span>
The contamination cleanup strategy called bioremediation—using naturally occurring or genetically modified microbes to clean up our messes—is gaining steam, as scientists devise new ways to use bugs against mercury, oil spills, radioactive waste and more.
There is a vestigial pelvic bone in whales which makes some people believe that their ancestors walked. Bones in the flippers have the same bones as land mammals arms and birds wings do which indicates divergence from the same ancestors.