Natural resources are materials from the earth and are either renewable or nonrenewable. some of these resources are recoverable after their first use. an example of resource recovery is a) mining of coal. b) extraction of petroleum. c) production of greenhouse gases. d) composting plants and food wastes.

What feature of cell theory is best demonstrated in the image

Explain how fossils scientists make discoveries about the lives of organisms and about how environments have changed over time. plz hurry up it time

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.