In her notes, Celeste wrote that the human body systems consist of molecules, cells, tissues, organs, and organ systems. What problem will Celeste have on her body systems test when she studies this information? A. She forgot to list organism as a level. B. She should have written chemicals/molecules. C. This is not the correct sequence. D. These are not body systems.

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.