Which is a part of the cell theory? a. cells come from pre-existing cells b. cells have a nucleus c. organisms with one cell must be seen with a microscope d. organisms must have more than one cell to live

What pattern of migration do whales follow?

How do living things obtain phosphorus

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.