Which of the following is true of mutations?
-a.) most mutations are beneficial. -b.) mutations can sometimes produce organisms with new & desirable characteristics. -c.) mutations produce changes that are not inheritable. -d.) mutations do not generally occur on genes.

2.) what is the small circular dna molecule found in some bacteria that can be used for cell transformation?
-a.) dna polymerase. -b.) electrophoresis. -c.) plasmids. -d.) recombinant dna.

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.