When does a human being become a human being?

It starts at conception. If a fetus becomes life, and one kills the fetus, then one has also killed the life. I believe it's called the transitive property, if you're into mathematics. Can life happen without the fetus? No so much. You kill the beginning and you've also killed the end. Life starts at conception because that's when the life form begins, and just because the life form is beginning doesn't mean that it should be regarded as anything less than life. I often wonder what would've happen if prominent leaders in our world had been aborted, such as Martin Luther King Jr., Nelson Mandela, Abraham Lincoln, to name a few...how different would our world be? Every life matters. Every fetus, matters.

I personally think it becomes a "human being" once it's capable of intelligent communications, but for some people that never happens. So for scientific and political purposes, I would say once it develops brain waves and a working nervous system.

When a person feels for others and help others when they are in a problem, he becomes a human being. A person should not disturb anyone in any way then only he can be a perfect human being

We are a specie. It is genetic. We are humans like cats are cats and dogs are dogs. So the first sign of an embryo is a human... because it can only give birth to an human. But I think you are talking about something else. You are talking about a fake human. A human which has been programmed to be civilize and believing in God. I would have to say that such a programmed human becomes a fake human at the age of six. This is the time when the child is allowed to start thinking for itself and start being allowed to make some decisions. During the first six years of its life... the child is programmed by his parents to become his parents. It is only once it is unleashed in primary school that it start discovering how the rest of the world lives through interacting with the other children. To find a true human... you need to go back to pre-historic times... some 10.000 years ago when humans lived in caves. On the other hand... only 300 years ago... aborigines in Australia were almost as primitive as the pre-historic men... as they had been untouch by any type of civilisation.

I believe from day 1. I see it as it is going to grow as a human being it has to be from day 1. It may just look like a blob on ultrasound in the early stages but as it progresses it does grow.

when he starts thinking of others before himself. apple.

I believe it becomes a human being at conception. Biologists and embryologists agree that life begins at conception. Some people believe it begins at implantation, but I'm not exactly sure where I stand on that argument.