Chalk is used to write on blackboard because

Most people first encounter chalk in school where it refers to blackboard chalk, which was originally made of mineral chalk, since it readily crumbles and leaves particles that stick loosely to rough surfaces, allowing it to make writing that can be readily era

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Explanation:

thats correct, but whats the question

explanation:

answer they showed that organic molecules such as amino acids could be produced from inoragnic molecules;