The energy in most ecosystmes comes from a green plants b the sun c wind d rain water?

9. the history of life on earth is recorded in

Anormal strand of dna is shown below, followed by the same strand of dna after mutations have occurred.

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.