Answer: mutation.
- A mutation
- B respiration
- C digestion
- D excretion
Correct answer: A. mutation
Explanation: Mutations create the genetic variation that natural selection acts upon.
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.