Answer: population.
- A population
- B single cell
- C body organ
- D tissue layer
Correct answer: A. population
Explanation: The Hardy–Weinberg principle applies to the gene pool of a population.
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.