Some individuals of a particular species of sea bird underwent a genetic mutation that resulted in larger beaks. the larger size of beaks these birds to break open clams and other mollusks for food. it also them defend themselves against predators. after many generations, almost all of the birds in the population had big beaks. for which two reasons did this phenomenon occur?

Its natural selection and survival of the fittest.

Explanation:

Variations occur due to sudden mutations. Some mutations might be harmful but some mutations may add advantageous feature to the species. Since large beaks helped those birds to break open clams, they survived better than the others. During the struggle for existence the one with better train survives and forms the future generations. This is called survival of the fittest. The one which is fit gets selected by the nature, a concept of natural selection proposed by Darwin.

Its natural selection and survival of the fittest.

Explanation:

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1) gene flow

- it is described as the transfer of genes from one population to another population so that frequency of gene is increased.

-a zebra migrates to join a different herd of zebras.

2) natural selection

- a mechanism of evolutionary change in which individuals with advantageous traits survive and reproduce whereas the others ( those that can not adapt) eliminate from the population.

-competition for sunlight leads to taller trees.

3) mutation

- permanent change in the nucleotide sequence of dna ( genetic material) that could have harmful or useful consequences.

-the dna of a snake changes to make its venom stronger.

4) genetic drift - it is a random phenomenon ( that occurs by chance such as fire) that results in change in the gene frequency in a small population.    

-a grassfire randomly sweeps through a population of buffalo and kills most of the animals.

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