Evolution is a

a. theory because it is an explanation that is supported by extensive observations, experimentation, and reasoning.

b. prediction because it makes an educated guess about events that will occur in the future.

c. variable because it is a factor that can be changed during experimentation.

d. law because it has been proven without exception under certain stated conditions.

the answer is a, since no one responded i chose this answer! i do not need any

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.