Where is the productivity of plankton in the neritic and oceanic layers high? what is the reason for this?

Refer to the following graph of Carbon Assimilation vs. Irradiance of several cultures of dinoflagellates in the northern Baltic Sea. Samples were treated with varying levels of pH. What is the effect of pH on the metabolism of the cultures? a) The growth of the culture is limited by increasing pH. b) The growth of the culture is increased by increasing pH. c) The growth of the culture is not limited by increasing pH. d) The growth of the culture is not affected by increasing pH or increasing irradiation.

7. Which of the following does NOT contribute to the human impact on the environment?     A)  The size of the human population.   B)  Human affluence.   C)  The rapid evolution of humans compared to other species.   D)  The speed of change caused by humans.   8. Which of the following may be true of atmospheric CO2?   A)  The ocean will absorb the excess atmospheric CO2.   B)  Plant photosynthesis cannot compensate for increased atmospheric CO2.   C)  When tropical forests are logged, additional CO2 is released into the atmosphere.   D)  As permafrost melts, more atmospheric CO2 will be absorbed.

What does this picture show?