Even though the ostrich is a flightless bird, ostriches still possess wings that stretch approximately two meters across when fully extended
Scientists speculate that when dinosaurs became extinct some of the birds that lived during that time became land dwellers since
they were able to consume the food that the dinosaurs once ate. Over time, these species grew larger and heavier. Eventually, the
ostrich species became too big to fly.
The wings found on ostriches are known as
OA. analogous structures.
OB. symmetrical structures.
OC. homologous structures
OD. vestigial structures

D. Vestigial Structures

Explanation:

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.

explanation:

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