In the early appearance of mankind, humans lived from farming and hunting in order to survive. The morality of that lifestyle had not been questioned at that time because the survival of the human kind depended on it. As humankind evolved, its ways and technologies changed too and with that, knowledge evolved. As a result many found ways to find all the needed nutriments for their bodies without hunting and harming animals. Some even found ways so that they would not consume animals or their products. They’re known as vegans.