A craton is a large, stable portion of Earth's lithosphere that makes up part of a continent. The Kaapvaal craton in Africa is one of five ancient cratons left from the
Precambrian era. The rock has remained tectonically stable since its formation 3.6
billion to 2 billion years ago. What do you think the term "tectonically stable" means
Why do you think this rock formation is important to understanding the history of Ea
Do you think studying ancient rock formations such as the Kaapvaal craton can tea
scientists not only about Earth's past but also its future? Why or why not?

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.