A. The oceans.
That is because oceans absorb more than a quarter of the carbon dioxide that humans produce.
Hope that helped.
Malignant tumors are classified according to the type of cells that give rise to them.
Vestigial structures are often homologous to structures that are functioning normally in other species. Therefore, vestigial structures can be considered the evidence for evolution, the process by which beneficial heritable traits arise in populations over an extended period of time.