Answer:
i think the answer is d, cause each civilization originated from an river but that all i can remember about them
i hope this may help
Explanation:
<span>Hughes seems sarcastic because the language that he uses is sarcastic. He is aggravated over the treatment of African Americans in Harlem at that time. He directs his sarcasm toward white people. He is aggravated that there are still many places that African American's cannot go (clubs), including a club called the Cotton Club. His feelings are justified because discrimination was alive and well during this time period.</span>
The answer would be, A. It absorbs organic materials in the environment.
Hope it helps.
a system of ideas and ideals, especially one which forms the basis of economic or political theory and policy.