All sisters are females and they are siblings. The property of being a female sibling implies the property of being a sister. All female siblings must be sisters. Something is a triangle just in case it is trilateral. Abortion is Murder 2.
Abortion is Wrong.
When applied to actions, appropriate and inappropriate are normative terms. X. Descriptive reasons explain an agent's actual behavior, usually in terms of her actual motivation. Usually includes some minimal universal rights or obligations.