Natural is the survival of the fittest. The natural condition is for the weak, lame, and sick to be mercilessly exterminated. Dying of old age is not natural. In a state of nature, most deaths are violent, painful, or agonizing. It is the constant struggle for survival perceived by Charles Darwin.
Civilization is artificial.
The artificial institution of law helps to channel human predatory instincts to more humane purposes. Technology is artificial. The inquiring minds of the human species have discovered or created the means to enable the survival of the weak, lame, and sick. Medicine has lowered the mortality rates from disease, accident, and violence. Improved production methods have made starvation a relatively rare cause of human death.