A human being is a liver? A liver is a human being? It's a human liver, but it's not a human being. If you have a human heart being preserved, to be transplanted in another person, is that heart a HUMAN BEING? No. It's a human heart, but it's not a human being. There's a lot more to being a human being than DNA. Just because something has human DNA, doesn't make it a human being. There are animals today, that have human DNA, even plants. They're created in labs by scientists, but that doesn't make a mouse that possesses human DNA, a human being. There's a lot more to being a human BEING, than DNA. A zygote, an embryo, a half-brained fetus, isn't a human being, it's a potential human being.