Genes act by directing the formation of: amino acids, chromosomes, specific enzymes

The correct answer will be option- formation of amino acids.

Explanation:

The DNA contains specific coding sequences called genes which contain codes for the formation of the proteins by the production of specific amino acids. The genes undergo two important processes: transcription and translation.

The genes present in the DNA forms a transcript molecule called mRNA via transcription process which gets translated to the amino acids as mRNA contains codons which code for specific amino acids. These amino acids get bonded to each other via a peptide bond and form proteins.

Thus, option- formation of amino acids is the correct answer.

a motor homunculus represents a map of brain areas dedicated to motor processing for different anatomical divisions of the body.

homunculus represents the importance of various parts of your body as seen by your brain. as a result, they take up a lot of brain space. although the cortical homunculus is a curiosity, penfield's work in mapping the brain's relationship to the body was invaluable.

the answer is d. chordata