Agroup of scientists wants to observe the adaptation of a foreign fish species in a river ecosystem. to do this, they want to enclose the top and sides of a section of a river to block light and matter from entering the area. evaluate whether this experimental system is an isolated system. justify your answer based on the definition of an isolated system.

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.