Coralline algae, sponges, and other organisms contribute is a fact. All the others are opinions
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Are these meant to be titles of something (a book, movie, etc)? If so, then they should either be in quotation marks or in italics.
Answer:
The main idea of this paragrph is the concept of medium of exchange.
Explanation:
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<span> The author best reveal that Iqbal is courageous </span>by describing actions such as: “seemed to look each of us in the eye”.
If you are going to picture out the scene, you would likely deduce that Iqbal's courage is also his confidence. Looking each of their eyes is just the same thing to say that "everything will be okay" and that they should not be anxious. Iqbal is very confident, never insecure.
