At the point of conception, you have a single-celled organism. It’s characteristics:
- It regulates its internal environment.
- It is composed of one or more cells.
- It consumes energy and creates cellular components.
- It grows.
- It responds to stimuli.
- It reproduces new cells.

These are the characteristics we use to define a single-celled bacteria as life. So it seems that at conception we can safely assume that the zygote is life.

Other characteristic:
- It has a unique set of DNA.

This is the characteristic we currently use to define life as a separate entity, ie not the mother, and not the father.

Ok, so it’s alive and it’s not the mother or the father.

At this point, you are asserting that this living creature is not human. You believe it will be human, but that it isn’t at this point, and that’s the justification for killing it.

To be correct, these must be true:
- Forms of life can change species during their lifetime.
- A species cannot be defined by a subset or compared difference of DNA.
- Based exclusively on the premise that the creature is not human, killing is moral.

I’d be interested to know if you believe those three things.