It's a common theme here that a human life begins at conception, with one egg and one sperm making a single entity with new, unique DNA therefore [insert argument here].
Identical twins show that a human life doesn't always begin at conception - sometimes it begins a few days later when the zygote splits into two or more separate zygotes. One egg and one sperm makes two, three or more entities with new, non-unique DNA. They're common enough that anyone using the above argument should know better.
Occasionally these are conjoined. One egg and one sperm making a single entity new, unique DNA that is usually considered to be two people - especially if they're separated after birth. This isn't as common, but it's well-enough known that again the arguer should be aware of it. When does a human life begin in this case?
Here's another scenario. One egg and two sperm makes one entity with too much new, unique DNA that might* divide into two entities with different DNA. When does a human life begin here?
Real life is messy. Any argument that relies on a human life beginning at conception won't necessarily apply in these cases - with consequences that mean the argument is at best incomplete. And since these cases are known to science, anyone invoking "Science" to support the claim that a human life starts at the moment egg and sperm combine doesn't know what the science is.
Which reminds me - most of those making these arguments also believe that humans have some form of soul or spirit that is independent of the body. When and how does that happen during the usual development process? When and how does it happen in these rare cases?
*But probably won't.
Identical twins show that a human life doesn't always begin at conception - sometimes it begins a few days later when the zygote splits into two or more separate zygotes. One egg and one sperm makes two, three or more entities with new, non-unique DNA. They're common enough that anyone using the above argument should know better.
Occasionally these are conjoined. One egg and one sperm making a single entity new, unique DNA that is usually considered to be two people - especially if they're separated after birth. This isn't as common, but it's well-enough known that again the arguer should be aware of it. When does a human life begin in this case?
Here's another scenario. One egg and two sperm makes one entity with too much new, unique DNA that might* divide into two entities with different DNA. When does a human life begin here?
Real life is messy. Any argument that relies on a human life beginning at conception won't necessarily apply in these cases - with consequences that mean the argument is at best incomplete. And since these cases are known to science, anyone invoking "Science" to support the claim that a human life starts at the moment egg and sperm combine doesn't know what the science is.
Which reminds me - most of those making these arguments also believe that humans have some form of soul or spirit that is independent of the body. When and how does that happen during the usual development process? When and how does it happen in these rare cases?
*But probably won't.
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