Answer:
d. carbon and hydrogen
Step-by-step explanation:
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In organic chemistry, it is said that the main atom, it means the atom that must be present in all the compounds classified as organic, is the carbon due to its straightforwardness to form very stable compounds in addition to the presence of hydrogen because all the organic compounds have at least one hydrogen in their structure. Remember that in organic chemistry there are aliphatic and aromatic hydrocarbons, alcohols, ketones, aldehydes, carboxylic acids, anhydrides and others and all of them have carbon and hydrogen in common.
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