When linnaeus began classifying organisms in the 1700s, he categorized them as plant, animal, or mineral. these kingdoms were later revised to exclude minerals and expanded to include animals, plants, fungi, protists, and bacteria. which of the following best explains a reason for this change?

It seems that you have forgotten the given choices for this question. But anyway, here is the answer. When Linnaeus began classifying organisms in the 1700s, he categorized them as plant, animal, or mineral. These kingdoms were later revised to exclude minerals and expanded to include animals, plants, fungi, protists, and bacteria. The statement that best explains a reason for this change is technological advances led to the discovery of single-celled organisms and increased our understanding of relationships between organisms. 

Possible answers are : 
As new organisms were discovered, new kingdoms were created to sort them based on ability to interbreed.

 It was discovered that the organisms in each of the five kingdoms have a different method of obtaining nutrients and are therefore fundamentally different.

 Technological advances led to the discovery of single-celled organisms and increased our understanding of relationships between organisms.

 Genetic research led to the discovery that each of these five kingdoms has a unique evolutionary ancestor.

Proteins are the workhorses of the cell, controlling virtually every reaction within as well as providing structure and serving as signals to other cells. proteins are long chains of  amino acids  , and the exact sequence of the amino acids determines the final structure and function of the protein. instructions for that sequence are encoded in  genes  . to make a particular protein, a messenger ribonucleic acid (mrna) copy is made from the gene (in the process called  transcription  ), and the mrna is transported to the  ribosome  . protein synthesis, also called  translation  , begins when the two ribosomal subunits link onto the mrna. this step, called initiation, is followed by elongation, in which successive amino acids are added to the growing chain, brought in by transfer rnas (trnas). in this step, the ribosome reads the  nucleotides  of mrna three by three, in units called  codons  , and matches each to three nucleotides on the trna, called the anticodon. finally, during termination, the ribosome unbinds from the mrna, and the  amino acid  chain goes on to be processed and folded to make the final, functional protein