Which statements about particle movement in the image to the right are true? check all that apply

they are moving from an area of high concentration to an area of low concentration

it requires energy

it occurs naturally by diffusion

it involves the hell of carrier proteins

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.