Throughout the day there are changes in carbon dioxide concentration. The peak is at 8 AM at 1000 ppm and The lowest is at 4 PM at approximately 700 ppm. The earlier it is, the more concentration of carbon dioxide and in the evening it is there is less concentration of carbon dioxide . Hope this helps :)
What's the questions here ?
Answer:
B. the hormone must enter the cell
The answer is A: phytoplankton provides nutrients to consumers in the ecosystem.
Hope this helps:)
