The distinctive mating signals that have evolved as part of an animal's courtship illustrate what ...

The distinctive mating signals that have evolved as part of an animal's courtship illustrate what type of
  reproductive isolating mechanism?
  a. behavioral isolation
  b. mechanical isolation
  c. gametic isolation
  d. temporal isolation
  e. hybrid breakdown

Question 2

Species whose ranges overlap, but do not interbreed because they are found in different environments
  or areas within the range, are said to exhibit:a.
   environmental isolation.
  b. biological isolation.
  c. evolutionary isolation.
  d. habitat isolation.
  e. temporal isolation