Answer :

Your answer would be Genes.

Answer: Genes

Explanation:

The cars are the part of the train. This means that the genes are the part of the DNA.

The genes are the small components of the DNA. The functional unit of DNA are genes.

These genes are responsible for the characters that is transferred by DNA from one generation to another generation.

It can be said that the genes are the functional unit of DNA as Cars are the functional unit of train.

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