After the discovery of T. aquaticus, biologists found forms of life adapted to extraordinary levels ...

After the discovery of T. aquaticus, biologists found
  forms of life adapted to extraordinary levels of
  a. acidity.
  b. alkalinity.
  c. salinity.
  d. pressure.
  e. all of these.

Question 2

The bacterium Thermus aquaticus proved to be
  important in biology because
  a. it put researchers on a path that led to the great
  domain of life, the Archaea.
  b. it makes a heat resistant enzyme.
  c. its heat-resistant enzyme can catalyze the
  polymerase chain reaction.
  d. synthetic forms of its heat-resistant enzyme
  triggered a revolution in biotechnology.
  e. all of these are true.