Answer:
A product of photosynthesis and cellular respiration
Explanation:
yes, and???????, you need to put more detail, that would be considered a Statement not a question.
Thomas could maybe look back through his day and see where he put them
An independent variable is a variable which change is not affected by that of another variable. By process of elimination you can take out B and C. An independent variable can also change so that takes out A. That leaves D.