Question

multiple - choice question
what is our evidence of luca which is the common ancestor we can link all living organisms to?
goelogic evidence
dna
homologous structures.
geographic evidence.
rewatch submit

Explanation:

LUCA (Last Universal Common Ancestor) is traced through genetic material. DNA is the genetic blueprint that is passed down through generations. All living organisms have DNA (or RNA in some viruses, but LUCA is hypothesized to have had DNA - based genetics). Geologic evidence gives information about the Earth's history and fossil records but not directly about LUCA's genetic connection. Homologous structures are anatomical similarities due to common ancestry but are more about evolutionary divergence from a common ancestor rather than the direct evidence of the genetic link to LUCA. Geographic evidence relates to the distribution of organisms and is not the key evidence for the genetic link to LUCA.

Answer:

DNA