The major effect of genetic drift is.. a) a reduction in genetic variability. b) an increase in genetic variation to accommodate changes in abiotic conditions. c) no change in population size but an increase in favorable alleles. d) a reduction in population size and an increase in genetic variability.

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 a. analogous structures. b. homologous structures. c. vestigial structures. d. symmetrical structures.