Answer: in water (the oceans).
- A on dry land surfaces
- B in water (the oceans)
- C high in the atmosphere
- D deep inside solid rock
Correct answer: B. in water (the oceans)
Explanation: According to the chemical theory of origin of life, the first non-cellular and cellular forms arose in water, the primitive ocean.
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.