1.1. The Norris Geyser Basin in Yellowstone National Park is a pool of boiling, acidic water. 

A number of species of bacteria have been found living in the geyser, including Thermus aquaticus.

What term is used to describe organisms that can survive in severe conditions such as the boiling, acidic water of the Norris Geyser Basin?

1.2. Taq polymerase is a thermostable enzyme found in Thermus aquaticus in the Norris Geyser Basin.

Suggest an explanation why most microorganisms cannot survive at high temperatures such as those found in the Norris Geyser Basin, but Thermus aquaticus can survive. 

1.3. In the 18th Century, an English settler in Australia released a number of rabbits into the wild for hunting purposes. 

Rabbits are not native to Australia. 

There are now millions of rabbits in Australia, and they are thought to be responsible for the loss of a number of native species. 

In the 1990s, a number of lionfish escaped into the Atlantic Ocean from an aquarium; their population in the Atlantic now numbers in the thousands. 

Suggest explanations for the large increases in population size of both species described above.