Answer:
<em>The impact of a drug on cancer. </em>
IV: drug DV: reduced/increased/neutral cancer growth.
<em>Plants grow more when exposed to trap music. </em>
IV: trap music DV: plant growth indicators (height, biomass, etc.)
<em>Exercise improves health. </em>
IV: Exercise regime DV: health indicators
<em>Does the amount of vitamin A in their diet affect the weight of rats? </em>
IV: amount of vitamin A DV: weight of rats.
Explanation:
First, it is imperative to understand what dependent and independent variables are.
<em>Dependent variables are the main variables researchers set out to determine during the course of an experiment.</em> Their values are dependent on some other variables that are inputted by the researchers.
<em>Independent variables are variables that are directly inputted by researchers. </em>Their values can be manipulated or varied to see the kind of effects they will have on dependent variables.
Hence;
- To determine the impact of a drug on cancer, the<u> input/independent variable would be the drug itself</u> while the <u>dependent variable would be the kind of effects they produce on cancer - reduced, increased or, neutral growth.</u>
- Plants grow more when exposed to trap music: the<u> input/independent variable would be trap music</u> while the <u>dependent variable would be heigh, biomass, or any other indicator of growth in plants</u>.
- Exercise improves health: <u>the input/independent variable would be exercise regimes</u> while the i<u>ndependent variable would be indicators of health. </u>
- Does the amount of vitamin A in their diet affect the weight of rats?: <u>the input/independent variable here would be the amount of vitamin A </u>while the <u>dependent variable would the weight of rats.</u>