Now that Sally understands each step, she must complete her investigation. She would like to create the water cycle inside of a bottle to prove that it works. Which of the following must she have in order for her investigation to work? (Mark all correct answers) Source of heat
Source of cooling
Source of vegetation (to represent trees)
Source of land for groundwater

Which statement explains which component is likely to be more powerful in explaining a scientific phenomenon? a) component c, because a theory is often passed on possibility and not certainty b) component d, because a hypothesis is often based on possibility not certainty c) component c, because the ability to explain several occurrences in the natural world is a characteristic of a hypothesis d) component d, because the ability to explain several occurrences in the natural world is a characteristic of a theory