Why are phytoplankton so important? A. They use up the nitrogen
B. They consume carbohydrates
C. They produce over 90% of the ocean's carbohydrates
D. They absorb the sunlight

Ibelieve its b but u might have to

The answer to this will be from your lab notes/procedure. it would be best to ask another student who participated in the lab as we do not know what was done, what enzyme or if the temperature is celsius or fahrenheit. if i were to guess though i'd say the rate stopped due to enzyme denturing at high temperature

The mesophyll chloroplast and thylakoids

I'm guessing that it's referencing the common folk or people of town or the people who are in the middle of the social and economical hierarchy