I think the answer is ozone i hope i am right and hope this helps
When Went placed the agar block on one side of the decapitated shoot, the shoot curved away from the agar as it grew. This demonstrated that some kind of hormonal signal had diffused into the agar from the coleoptile tips. ... Went's experiment represented the first time that anyone had isolated a hormone from plants.
Answer:
If you were to ask me I would say that your answer is C
Explanation:
3. Autotrophs produce organic molecules. I think 4 is cellular respiration cannot occur without photosynthesis
