Fact 1: Specialization occurs when competing species evolve different adaptations.

Fact 2: Beaks show a lot of variation and specialization for different functions.

Given the two facts above, answer the question "What is the reason beak variation came about in birds?" with the following options: 
- 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


 

     Competing species evolving    