This makes it quite clear (thanks Cliff!).
In other words, wombs are not teleological and neither are zygotes and neonates in those wombs.
Death to teleology!
My uncle did all this incredible research on the placenta. It turns out there's a retrovirus called ERV-3 that sits in your DNA. It probably codes for immunosuppressive properties of the placental barrier.
In other words you are reading this sentence because a virus in your mom's genes caused her not to abort you spontaneously.
There's a full discussion of it in The Ecological Thought. This is the kind of thing that gets into my work a lot.