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The answer would be H and C only. Hydrocarbons are organic compounds consisting entirely of carbon and hydrogen. They are the simplest form of organic compounds. They are joined together by covalent bonds. They can be straight-chain, cyclic or branched chain.
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Answer:

[tex]\boxed{\mathrm{only \ H \ and \ C}}[/tex]

Explanation:

Hydrocarbons are organic chemical compounds that only consist of hydrogen and carbon atoms. The carbon atoms are joined in various ways, the hydrogen atoms attach to the carbon atoms.

Example of Hydrocarbon : [tex]\sf C_6H_{14}[/tex]