Question

Lines of evidence from many fields of study, from fossils to DNA sequences, have been important in developing evolutionary theory. Why is it important to have supporting evidence from a variety of fields?

Answer 1

Whenever any theory is given then it is not just given by one observation, there are many observations on which a single theory is given. There can be different kinds of observations and evidences from a variety of fields to support a theory so that the result is accurate and precise.

Whenever any experiment is done it is also done with a large sample space so the results are correct and accurate.

That is why the theory of evolution has evidences from different fields like from fossils and from DNA sequences, phylogenetic tree and many more places.

Answer 2

One reason why it's important to collect evidence from many fields is that the methodology of each field can introduce a bias through its measurement methods.

For example, imagine that we find out that our method of sequencing DNA is proven to be wrong - if we collect information from many different fields, then this will not invalidate the evolutionary theory, as evidence from other fields still supports it.