What was LUCA?
A) the first life-form
B) a population of life-forms that was the last common ancestor of life on Earth today
C) the only life-form present before our current lineage
D) the last universal ancestral life-form: a single individual

Question

Quizplus · Accepted Answer

LUCA stands for Last Universal Common Ancestor, which is a population of organisms that were the last common ancestor of all life on Earth today. It is not a single individual, but rather a group of organisms that gave rise to all other forms of life on our planet. Therefore, the best choice would be B, as it accurately describes LUCA.

What Was LUCA