text: In general, biosignatures can be grouped into ten broad categories:
  #Isotope patterns: Isotopic evidence or patterns that require biological processes.
  #Chemistry: Chemical features that require biological activity.
  #Organic matter: Organics formed by biological processes.
  #Minerals: Minerals or biomineral-phases whose composition and/or morphology indicate biological activity (e.g., biomagnetite).
  #Microscopic structures and textures: Biologically formed cements, microtextures, microfossils, and films.
  #Macroscopic physical structures and textures: Structures that indicate microbial ecosystems, biofilms (e.g., stromatolites), or fossils of larger organisms.
  #Temporal variability: Variations in time of atmospheric gases, reflectivity, or macroscopic appearance that indicates life's presence.
  #Surface reflectance features: Large-scale reflectance features due to biological pigments could be detected remotely.
  #Atmospheric gases: Gases formed by metabolic and/or aqueous processes, which may be present on a planet-wide scale.
  #Technosignatures: Signatures that indicate a technologically advanced civilization.