Answer: coacervates.
- A simple viroids
- B naked genes
- C free ribozymes
- D coacervates
Correct answer: D. coacervates
Explanation: Oparin suggested that organic molecules clustered into coacervates, droplets that are regarded as precursors of the first cells.
A simple phylogenetic tree: a common ancestor branches into several descendant lineages over time, with each branch point marking a speciation event.
Concept context
Origin of life, Darwin's theory, natural selection, speciation, and evidence for evolution.