How do bacteria cause disease? O A. By reproducing inside a host cell and causing the cell to break
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B. By replacing the host cells with bacterial cells
C. By releasing harmful proteins or other poisons into the host's body
D. By injecting DNA into the genome of a host cell

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.