Describe how the 20 amino acids are similar yet different in their structure

They are different in structure because of their side groups because this is what makes each of the amino acids in our body, which will point out their own difference towards one another. Their similarities and what they have in common is they all have chemical structures in their amino acid molecules.

There are no options but generally    photosynthesis uses light to excite electrons and  utilising  chlorophyll  then uses this energy to convert co2 to glucose.  cellular respiration uses glucose to produce atp (energy) and releases co2 as a waste product.