Given that life arose once, could it arise again?
The Origins of Life
All organisms currently living on earth are descended from a common ancestor, referred to as the Last Universal Common Ancestor (LUCA), which is currently estimated to have lived slightly less than 4.5 billion years ago. The biochemical commonalities across all known species, especially the relationship between DNA, RNA, and protein, and the fact that the DNA uses the same basepair sequences to code for the same amino acids regardless of species, are the main evidence that we are all descended from one ancestor. If there were separate "life origin" events for the different taxonomic groups, each group would almost certainly have its own set of biochemical rules.
Answer and Explanation:
All known modern organisms are descended from LUCA, but that doesn't mean LUCA was the first life form ever, or even directly descended from the first...
See full answer below.
Become a member and unlock all Study Answers
Try it risk-free for 30 daysTry it risk-free
Ask a question
Our experts can answer your tough homework and study questions.Ask a question Ask a question
Learn more about this topic:
from Science 101: Intro to Natural SciencesChapter 15 / Lesson 1