So the people who have been in a coma are not a human at that point? You’re a sick individual.If you read along, it is descriptive of characteristics that do not resemble a zygote or embryo beyond just physical characteristics but mental ones as well like a brain capable of abstract reasoning. The brain of a fetus doesn't develop for weeks and then many more weeks until the brain develops so I am not sure at what point science would declare it to be a human.
Now, as I said... personally I believe that is when human life begins but I can respect the argument that does not believe that they are not ending a human life but a potential one.