Which of the following best indicates that the light reactions of photosynthesis have completed and that the calvin cycle has begun A) Electrons are transferred across the electron transport chain (ETC)on the thylakoid membrane.
B) ATP and NADPH accumulate in the stroma
C) An electrochemical gradient forms across the thylakoid membrane.
D) A high concentration of carbohydrates is found in the thylakoid lumen.

the electromagnetic energy from the sun arrives in the form of visible and invisible light.

the correct answer is - d. china has a large and growing population.

the fact that china has a large (the biggest) population, and it is still growing, doesn't hinder the agriculture production in the country. in fact, it can for increased production in the agriculture, since there's more labor force, as well the sheer mass of people produces lots of scientists that come up with new inventions as to how to improve this sector. nice example is the inner mongolia region in china, in general dominated by the gobi desert, but few scientist came up with a nice idea as to how to make the region productive by using plants that are very resistant to droughts, so lots of people have been employed, and the region is becoming greener and greener each year, and the production of food in this region is also increasing.