Which correctly describes the set of clades that contain the arthropods, from largest to smallest?

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

b exhibiting favoritism toward the kikuyu people.

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

it's d - life cycles - apex