Which of the following is true of the spread of viruses? a. if a virus spreads to larger areas such as full continents, it is referred to as an epidemic. b. a pandemic occurs from the spread of an epidemic, over major continents and even the entire world. c. an epidemic occurs from the spread of a pandemic, over major continents and even the entire world. d. a pandemic includes the infection of many people in a smaller area.

As a small change in a person's dna can cause a genetic disorder

African penguins, which inhabit the coasts of southern africa, were classified as an endangered species in 2010. two significant threats to their survival are ecosystem damage from oil spills and overfishing by humans. overfishing depletes the food supply of african penguins. the best method to reduce the threat of overfishing would be to . the risk of oil spills could be reduced by increasing the use of , which should oil consumption. if an oil spill does occur, could be used to remove the oil so the ecosystem may more quickly recover.

The chemical form of energy that is useable by the cell to do work