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.
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.
was caused by global warming that left ocean animals unable to breathe. The largest extinction in Earth's history marked the end of the Permian period, some 252 million years ago
The life expectancy has been rising. There is an improvement by two-thirds n life expectancy age since 1881. This is the same trend generally in the developing world. This is attributed to improvement in other indicators such as sanitation, health care and literacy rates that have improved the lifestyles of the people significantly.
When listing the levels of organization in organisms from smallest to most complex, "tissue" would be just below organs in complexity because organs are made of tissues.
