There is no substance absolutely restricted to Earth (unless you count DNA, proteins, etc., but these are almost guaranteed to exist somewhere else).
WateR
the simplest substance is air
Carbon is a chemical substance found in the Earth but not formed by plants or animals.
Water
water
Water can be ice,liquid, and gas when boiled.
rain
destiny
Hydrogen is commonly found in water, but not as a pure substance.
your fat mom.
What is a fatty substance found only in animal tissues
Cholesterol is a waxy fat-like substance found only in animal products.