Threat to marine mammals such as the orcakiller whale

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threat to marine mammals such as the orca/killer whaleHomogenization of taxa– the spread of introduced species and native generalists, coupled with declining abundances and distributions of native specialists are part of a growing taxonomic homogenization of earth’s biotaEx. US Fish Faunas are undergoing taxonomic homogenizationincrease in the number of shared species among the statesThylacine– pouched mammal native to Australian and Tasmania
27. How many major extinction events have been found in the fossil record? What taxa are facing major extinctions right now?
28. Name the 4 main causes of the loss of biodiversity and rank them in order of impact. Be able to give examples of each.

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