Final answer:
Scientists can determine the similarities and differences between species by looking at the DNA of different organisms. DNA comparison can help trace evolutionary history and understand gene functions. Studying DNA provides valuable information about evolutionary relationships and genetic functions.
Step-by-step explanation:
It is helpful for scientists to be able to look at the DNA of different organisms because it allows them to determine the similarities and differences between species. By comparing DNA sequences, scientists can determine how closely related different organisms are and trace their evolutionary history. For example, comparing the DNA of humans and chimpanzees has provided evidence to support the theory of common ancestry.
Additionally, studying DNA can help scientists identify and understand specific genes and their functions. This can be particularly useful in fields such as medicine, where knowing the DNA sequence of an organism can help in the development of treatments and therapies.
Overall, being able to examine the DNA of different organisms provides scientists with valuable information about evolutionary relationships and genetic functions.