We now know more about an organisms,______ which allows us to further change our system of classification? DNALocations where organisms liveThe parents of the organisms we study

The answer is DNA. With advancements in technology, we are now able to study an organism's DNA. This has greatly improved our understanding of the similarities and differences between different organisms, allowing us to refine our system of classification.

Here are the steps to answer this question:

1. Understand the question: The question is asking which factor has allowed us to improve our system of classifying organisms.

2. Evaluate the options: The options given are DNA, locations where organisms live, and the parents of the organisms we study.

3. Choose the correct option: While the locations where organisms live and their parents can provide some information about organisms, it is the study of DNA that has revolutionized our understanding of organisms and allowed us to refine our system of classification.

4. Formulate the answer: Therefore, the answer is DNA.