How do vestigial organs provide evidence for the theory of evolution? A Vestigial organs show differences between our DNA and the DNA of amoebas. B Vestigial organs show traits that a species once needed to have to perform certain tasks. C Vestigial organs show the variation in genes that can exist within one species. D Vestigial organs show how many cells organisms of a species once had.

Use the drop-down menus to match each part of the scenario to the correct scientific practice. akira records the speed of a reaction without a catalyst and then with a catalyst. akira creates a reaction without a catalyst and repeats the reaction with a catalyst. akira turns in a written lab report to his science teacher. akira wonders, "will adding a catalyst speed up this chemical reaction? " akira writes in his notes that adding a catalyst sped up the chemical reaction because the catalyst lowers the activation energy needed to get the reaction started.