A person cannot see a single cotton thread 4 classrooms away. However it would be visible if you wound thousands of threads together into a rope. How is this statement an analogy of our DNA extraction

As scientists have investigated evolution from a variety of fields, they have found that some of darwin's orginal ideas were inaccurate or incomplete. t explanation provided by evolution was updated each time to reflect the new information they found. what does this suggest about the theory of evolution? it has become a stronger and clearer theory as new information is collected.