2b: A Human Being is a Human Organism

Premise 2b¹ states that a fetus is a human being. “Human being” is the philosophical term for an individual member of the species homo sapiens. It’s exactly the same thing that biologists mean when they say “human organism.” Conceptually the two—“human being” and “human organism”—are synonymous. Therefore, Premise 2b can be rephrased to read, “An unborn child is a human organism from the moment of conception.”

But… what is an organism?