+13c is a stable, naturally occurring [Isotope](/wiki/Isotope) of [Carbon](/wiki/Carbon). It makes up about 1.1% of all carbon on Earth, being heavier than the more common 12c. Its distinct atomic mass is invaluable for tracing pathways in biological systems, paleoclimate research, and environmental studies.
+## See also
+- [Isotope Analysis](/wiki/Isotope_Analysis)
+- [Stable Isotope](/wiki/Stable_Isotope)
+- [Carbon-14](/wiki/Carbon-14)
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