If We Had a Natural Explanation for Morals, Would that Mean Morals Aren’t Objective?

Oxford Mathematician John Lennox uses an example in his lectures to illustrate the fact that an event can have more than one explanation without creating a contradiction. He asks why does water boil? I might answer that heat energy is transferred to the molecules of water, which begin to move more quickly. Eventually, the molecules have too much energy to stay connected as a liquid. When this occurs, they form gaseous molecules of water vapor, which float to the surface as bubbles and travel into the air. (HT: Wonderopolis.com for that wording). Alternatively, I might answer that the water boils because I want a cup of tea. Both answers are correct. The first answer is scientific in that it explains the physics that leads water to boil. It is what Aristotle would have called the "material cause" for the water boiling. The second is just as correct, but it isn’t a scientific explanation at all; rather, it provides an explanation in terms of purpose or end, i.e., that ...