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We all know the truth ____ there are air, water and sunlight there are living things. 

A. that wherever 

B. wherever

the truth 后面是它的同位语从句，要用 that 引导。同位语从句包含由wherever 引导的让步状语从句：wherever there are air, water and sunlight,而there are living things，为主句。所以选择 that wherever。

We all know the truth that wherever there are air, water and sunlight there are living things.  （划线部分为 the truth 的同位语从句）