Science does not say anything. Scientists do. Some scientists are like you...ignorant. They want to assert that from the moment of conception, there is a living human being.
There isn't.
The fact that a human life begins as a zygote is not the same as saying that a zygote is a living human. A zygote is not a living human.
There is debate about when a growing clump of cells becomes a living human being. That was even mentioned in the article you cited. Some people say it does not happen until the clump exits into the world; some say it happens with ensoulment. Scientists do not answer that question...in fact, the question may not be answerable. But until born, the growing clump should not have more rights than the woman in whose body it is being carried.
You are now free to crawl back under your favorite rock.
I know it is only science if it agrees with arrogant elitist Democrats like you