Necessary for survival but not synthesized by the organism, thus needing to be ingested
Being in the basic form; showing its essence. Example: Don’t mind him being grumpy. That’s the essential Fred.
Really existing; existent.
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.
Idiopathic.
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