You are presented with the question "What can make the bottleneck effect occur in fish?" and the following answer choices: 
- increased habitat
 - acid rain
 - humans
 - Winter
 - increased food
 - storms
 - increased resources
 - Toxicity

Now knowing that bottleneck effect occurs when a population suddenly gets much smaller and fishing pressure is relatively low due to a smaller human population, choose the best answer.


 

   humans      