You are presented with the question "What is the reason beak variation came about in birds?" and the following answer choices: 
- By wind and rain
 - Attracting mates
 - It helps them survive
 - the Earth being tilted
 - Competing species evolving
 - it keeps an organism warm
 - To assist in flying
 - Warding off predators

Now knowing that specialization occurs when competing species evolve different adaptations and beaks show a lot of variation and specialization for different functions, choose the best answer.


 

     Competing species evolving    