Which statement best describes divergent evolution?

Which statement best describes divergent evolution?

• A. Two unrelated species becoming more similar over time.
• B. Related lineages accumulate differences, forming distinct species.
• C. Two species merge into one.
• D. One species acquires identical traits due to convergent evolution.

Answer: (B)

Divergent evolution happens when related species start from a common ancestor but adapt in different ways to distinct environments, so their features become increasingly different and new species can form. The statement that best describes this is that related lineages accumulate differences, forming distinct species. This captures the idea of a branching pattern: from one lineage, new lineages diverge as they adapt to different niches, eventually becoming separate species. An example is Darwin’s finches, where different populations evolved various beak shapes to exploit different food sources, illustrating how related organisms can diverge over time. The other scenarios describe convergent evolution or fusion rather than divergence: unrelated species becoming more similar reflects convergence, not divergence; two species merging into one isn’t about divergent change; and one species acquiring identical traits due to convergent evolution also points to convergence, not divergence.

Divergent evolution happens when related species start from a common ancestor but adapt in different ways to distinct environments, so their features become increasingly different and new species can form. The statement that best describes this is that related lineages accumulate differences, forming distinct species. This captures the idea of a branching pattern: from one lineage, new lineages diverge as they adapt to different niches, eventually becoming separate species. An example is Darwin’s finches, where different populations evolved various beak shapes to exploit different food sources, illustrating how related organisms can diverge over time.

The other scenarios describe convergent evolution or fusion rather than divergence: unrelated species becoming more similar reflects convergence, not divergence; two species merging into one isn’t about divergent change; and one species acquiring identical traits due to convergent evolution also points to convergence, not divergence.