Specialization occurs when competing species evolve different adaptations, and beaks show a lot of variation and specialization for different functions. Given these facts, what is the reason beak variation came about in birds among 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    