What is the main obstacle to using wind power to generate electricity a. to expensive b. it is not sufficient to power the modern lifestyle c. it cannot be stored d. all of the above

What happens when the cell copies its chromosomes

Name the part of the the brain labeled "e".

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.