1º_ It is a neologism to name the biometric identification method, which recognizes our identity by some part or characteristic of our body. 2º_ It is a marker that leaves a living organism and that can be found even after death. Fossil residues are searched to determine what flora and fauna existed in the same place and period. 3º_ Exobiology also looks for biosignatures in rocks fallen from space or in images of other planets that show, p. and. , traces of photosynthesis. See biomarker .
