Research has shown that commercial fisheries place selective pressure on fish populations by ...

Research has shown that commercial fisheries place selective pressure on fish populations by
  harvesting mostly the ____ fish, resulting in ____.
 
  a. young; aging populations
  b. larger; maturity at smaller sizes
  c. smaller; maturity at larger sizes
  d. prereproductive; declining birth rates
  e. postreproductive; no change in population size

Question 2

Recent studies have demonstrated evolution in populations over a span of time as short as ____.
 
  a. single years
  b. decades
  c. centuries
  d. thousands of years
  e. millions of years