Abuilding contractor needs 500 sheets of drywall. which is the most cost-effective way to buy them? 50 sheets at a time for $600 100 sheets at a time for $800 250 sheets at a time for $2,500 500 sheets at a time for $4,500

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.