What is the meaning of life? our science teacher asked us this

Honestly, It just depends on what your belief is. Some people, like the Christians and Muslims think its a test from God to see who's good and bad. Scientifically, its just a way for us humans to live and survive, and mate, and die old. 

The meaning of life in terms of science could be about the scientific needs of human, such as eating to live, reproducing to have a family and many other factors. In terms of religion, life could mean doing good karma and abiding by the rules within a community. Altogether, the meaning of life in my opinion, is living in the human body and experiencing different situations - which could also involve problems and challenges.