What are things that are not cohesive

not cohesive is called non cohesive that means soil is any free-running type of soil, such as gravel or sand, whose strength depends on friction between soil particles. however cohesive soil hardens to a nearly cement matrix when dry. It does not allow water movement.

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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".

a covalent bond, specfically triple bond