<span>Correct answer: They end up in bodies of water killing animals and plant life. </span>
Answer:
Independent: Light intensity
Dependent: Rate of photosynthesis
Explanation:
The independent variable is the variable that changes, to determine if it has an effect on something.
The dependent variable is the variable that's measured.
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Scientists establish the age of a rock or fossil based on natural radioactive decay and certain elements such as potassium and carbon, this is used to make reliable “clocks” to date ancient events.
(Sorry if not all is accurate hope it helps)