Some are harmful and are likely to be eliminated by natural selection — by death of the embryo, for instance. (newscientist.com)
The clear message here — especially as it denounces in detail the various possible ways in which an embryo's dignity as a human being could be violated — is that not only the death of an embryo, but also any tampering with the well - being of this individual that might harm his integrity or well - being, is condemned. (faith.org.uk)
Obviously, pregnancy is not inherently safe since such a large proportion of pregnancies end in the death of the embryo. (skepticalob.com)