Both petroleum and coal are made up of complex carbon-based molecules, and both originated with living creatures of some kind. both are vital sources of energy for the modern world and both were formed by geologic processes over millions of years. however, petroleum was mainly formed from the remains of ocean-dwelling microorganisms. coal, on the other hand, originated from decayed vegetation in ancient swamps and bogs. in any case, it took millions of years for both coal and oil to be produced. this is the case because it took that much time for overlying sediments to produce the unimaginable heat and pressure that would one day allow us to harvest these energy resources. what is one clue word or phrase in the passage that indicates a contrast? a. because b. both c. however d. in any case

The organizing principle used in this paragraph is the principle of comparison and contrast. In order to write a well-structured compare and contrast paragraph, the writer needs to identify several key points that have at least two subjects in common. The similarities and differences between the subjects need to be highlighted. Lastly, the writer needs to expand on the subjects; their strengths and weaknesses, as well which subject is stronger than the other subjects. The opening sentence of this paragraph is a good start to a compare and contrasting paragraph

major league baseball

explanation:

jack roosevelt robinson broke the color barrier in major league baseball.as he was the first african american to play in the major leagues, jackie robinson became the target of racial abuse. jackie robinson is referring to the historic event, harlem riot.