Arrange the following to smallest to biggest

Human, nervous system, nerve tissue, neurons.

Explanation:

The organism is the biggest, in this case is a human, a human is composed of systems, and then organ tissue, and organ tissue is made out of cells.

that is true   : ) hope this you

in 1859, charles darwin set out his theory of evolution by natural selection as an explanation for adaptation and speciation. he defined natural selection as the "principle by which each slight variation [of a trait], if useful, is preserved".