Which of the following represents a good, controlled experiment?
frank hypothesized that warmer temperatures would make his tomatoes produce fruit sooner. he gathered 50 tomato plants and put them in identical pots. he raised the temperature in the tomato room and watched to see when they would produce tomatoes.

this headline suggests that midterm congressional   elections are at the corner and trump administration wants to activate his base by vowing to clamp down on immigrants and immigration as trump had said during his election campaign around two years ago. when a baby is born in usa, the baby becomes citizen of usa for 85 years and trump wants to end this rule of birthright citizenship to control illegal immigration and this what he said in an interview""we’re the only country in the world where a person comes in and has a baby, and the baby is essentially a citizen of the united states for 85 years, with all of those benefits,” "