We don't need a "Ladder"....For he spake, and it was done; Psalm 33:9
"Astrobiology Program has developed the “Ladder of Life Detection,” a guide for researchers where each rung represents a key attribute of life. The Ladder was published in the journal
Astrobiology on June 4, 2018.
The Ladder’s Biosignatures
“The Ladder of Life Detection lists 15 features that the astrobiology community proposed to represent indicators of life,” said Marc Neveu,...The Ladder also describes how scientists might measure these features and determine whether they really are evidence of life.
For instance, all life that we know of requires complex organic molecules and uses amino acids—two features in the Ladder." Astrobiology
"Astrobiology Program has developed the “Ladder of Life Detection,” a guide for researchers where each rung represents a key attribute of life. The Ladder was published in the journal
The Ladder’s Biosignatures
“The Ladder of Life Detection lists 15 features that the astrobiology community proposed to represent indicators of life,” said Marc Neveu,...The Ladder also describes how scientists might measure these features and determine whether they really are evidence of life.
For instance, all life that we know of requires complex organic molecules and uses amino acids—two features in the Ladder." Astrobiology