A constant is something that is kept the same throughout the course of a experiment. So I would guess C) because they are not doing anything special. If it’s not C then it is A. :)
Answer:
Even though it can be undone, a new product is formed in photosynthesis. So it's a chemical process
If the original strand is TACGGTACCGGA, the complementary strains is ATGCCATGGCCT
