Biology Forums - Study Force

One group of fruit flies reproduces in August and one group reproduces in September. Which of the
  following mechanisms is preventing them from cross breeding?
  a. hybrid sterility
  b. genetic isolation
  c. sexual isolation
  d. mechanical isolation
  e. temporal isolation

Question 2

Reproductive isolation mechanisms that prevent fertilization are termed:a.
   energetic barriers.
  b. biological barriers.
  c. postzygotic barriers.
  d. ecological barriers.
  e. prezygotic barriers.

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Thanks a whole bunch, all were right.

Thanks for confirming...