Which of the following factors made the land a place where the first land plants could thrive? Select the two correct answers. -evolution of animals
-low levels of oxygen in the atmosphere
-abundant sunlight for photosynthesis
-new, nutrient-rich soil made of cyanobacteria and deteriorating rock

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.