Question

A particular species of sea bird underwent a genetic mutation that resulted in big beaks. The larger size of beaks helped the bird to break open clams and other mollusks for food. It also helped them defend themselves against predators. After many generations, almost all of the organisms in the population have big beaks. For which two reasons did this phenomenon occur?

Answer 1

To match and help even out the other species in the ecosystem.

Answer 2

Answer: Out of the choices given in the question:

natural selection

mechanical isolation

prezygotic barriers to reproduction

high genetic variation in the species

Natural selection and High genetic variation in the species are the right answers.

Explanation:

I did a test with this same question and got it right. :)