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 truman doctrine was an american foreign policy whose stated purpose was to counter soviet geopolitical expansion during the cold war. it was announced to congress by president harry s. truman on march 12, 1947, and further developed on july 12, 1948, when he pledged to contain threats to greece and turkey.

it's     c       this is a cell (b) with a nucleus (c) containing dna (a). the dna is organized into chromosomes (d). a section of the chromosome that codes for a trait is called a gene (e).

i think the answer is a.keratin is the pigment responsible for skin color.