You need more context to the question, however I think I have it figured out.
Independent variable- various colors of light
dependent variable- The growth rate from each color
Carbon dioxide
Hope this helps!
The correct answer is D. Stream erosions need water after all.
Answer:
A friend is someone who is there for you when you need them and cares for you. Friends should support you on almost everything, except if your doing something bad or anything like that.
Explanation: