Answer:
Explanation:
A gene can be turned on or off by environmental factors or from other cells that activate proteins known as transcription factors.
I am not sure but here is a link to help you :)
https://www.ncbi.nlm.nih.gov/pubmed/22322095
Answer: <em>Photosy</em><em>nthesis</em>
The answer is C. A catalyst speeds up the rate of a chemical reaction. However, it is not consumed during the course of the day.
