What is the name of the two different types of subunits that make up a hemoglobin molecule, and how many of each subunit are found in one hemoglobin molecule?

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.