Final answer:
The universal genetic code shared by almost all organisms points to a common origin of life and is highly conserved due to evolutionary constraints, in line with Francis Crick's frozen accident hypothesis.
Step-by-step explanation:
The universal genetic code of almost all organisms signifies that the genetic information encoded within DNA, represented by sequences of nucleotides, is interpreted in a consistent manner across all known life forms. This consistency suggests a common origin back to the earliest forms of life on Earth. The origins of this code date back to the very beginning of life, implying that the genetic code was established early in evolutionary history and has remained largely unchanged due to constraints on its evolution. Changes to the genetic code are rare and often have deleterious effects, affirming the frozen accident hypothesis proposed by Francis Crick, which posits that any deviation from the established code would be so fundamentally disadvantageous as to be eliminated by natural selection.