Biogenic
Part of speech: adjective
Definition: produced by living organisms, or by a biological process essential for the maintenance of life
Essential
Part of speech: adjective
Definition: Necessary.Very important; of high importance.Being in the basic form; showing its essence.Such that each complementary region is irreducible, the boundary of each complementary region is incompressible by disks and monogons in the complementary region, and no leaf is a sphere or a torus bounding a solid torus in the manifold.
Part of speech: noun
Definition: A necessary ingredient.A fundamental ingredient.
Example sentence: They who can give up essential liberty to obtain a little temporary safety deserve neither liberty nor safety.