Which of the following is a carbohydrate? O A. C4H1503
O B. C7H1405N
C. C52H120070N30P21
O D. C5H1005
PEN

well, that's easy; the answer's c, "it reduces contamination of the water and substrate of the estuary."

primary succession occurs in essentially lifeless areas regions in which the soil is incapable of sustaining life as a result of such factors as lava flows, newly formed sand dunes, or rocks left from a retreating glacier. secondary succession occurs

if you listed your answers right then i believe your answer is b.