Er, yes, this is why I asked you to tell me what the conclusion of your argument is. Look, am I right in presuming that the following two statements are premises in an argument?
(Premise) The only known opinion ever expressed about any such notion as "morality", objective or otherwise, is an opinion voiced only by humans.
(Premise) No other known living things, have ever expressed any such notion.
I took a guess at what the conclusion was, based on your post. You told me I was wrong, so either tell me what the conclusion of this argument is, perhaps by adding implicit premises, or tell me that I was wrong to think that these were premises in any argument at all. Don't you agree that this is a sensible solution to avoid further misinterpretations?
Thanks much.
I don't think I can give a clear and precise definition, but perhaps I can list some essential features of morality. Part of the reason, incidentally, that a clear and precise definition is not possible is that the answer to the question, "What is morality?" depends on certain meta-ethical considerations. A realist will not answer the question in the same manner as an emotivist[1], for instance.
So, let me answer as a realist would. A fundamental feature of moral norms is that they are about the appropriateness of an act, not to fulfill this or that subjective end of the actor, but in order to attain some objective good[2]. The heart of a moral claim is an "ought" that is intended to express some objective good.
Now, we can actually drop the "objective" part for now, and just observe that moral theories consist of normative claims, that is, "ought" statements. Science does not deal in such normative claims. Scientific theories are purely descriptive in nature. The only way in which we can derive "ought" claims[3] from scientific theories is if we add some value judgment -- If I desire a fire, then (thanks to certain scientific facts) I ought to be sure there is enough oxygen in the area, but that I do indeed desire a fire is not something that I learn from science.
Insofar, then, as the currency of morality is normative claims and science deals in descriptions instead, the fundamental questions of morality are not scientific questions. Science can tell me what people believe they ought to do, but it can't tell me what they ought to do.
[1] Emotivism states that so-called moral claims are not claims at all,
convey no proposition at all, but rather are mere expressions of emotional reactions. If, for instance, I say, "Murder is wrong," I am saying nothing more than, "Murder! Yuck!"
[2] Even some moral realists may balk at this much. For Kantians, the moral status of an act is independent of its fitness to attain any end.
[3] Sometimes, "ought" statements aren't literally normative, as when one says, "It ought to rain today." I'm talking about normative "ought" statements.