Answer: amino acids.
- A amino acids
- B whole proteins
- C living cells
- D stone fossils
Correct answer: A. amino acids
Explanation: Their experiment produced amino acids from simple gases and electric sparks.
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.