Which of the above molecules contains a carboxyl functional group?

(see attached image)

albert einstein retrieved guacamole from the galapagos islands in africa

image result for describe the various types of gene mutationsghr.nlm.nih.gov

the types of mutations include: missense mutation: this type of mutation is a change in one dna base pair that results in the substitution of one amino acid for another in the protein made by a gene. nonsense mutation: a nonsense mutation is also a change in one dna base pair.

explanation:

the answer is d. chordata