stem, roots, leaves and flower
I hope it helps
Umm where is the question Is this a question ?
I think the answer would b C
Answer:
a. 
b. 
Explanation:
Hello.
In this case, according to the balanced chemical reaction, we can write the law of rate proportions:

Thus, we proceed as follows:
a. Since the rate of oxygen production is 0.15 M/min, we can make the following setup:

b. Since the rate of oxygen production is 0.15 M/min, we can make the following setup:

Best regards!