Question

Which statement about evolution is accurate?

Responses:

Animals, plants, and microbes have their own separate, unrelated ancestries.  

Scientists no longer study evolution because it has been proven.  

Living things have adapted and changed over time for specific, discoverable reasons.  

DNA is the only extant evidence supporting the theory of evolution.

Answer 1

The third statement is the most accurate — with an important clarification.

Correct version: living things have adapted and changed over time because of identifiable processes (natural selection, mutation, genetic drift, gene flow, etc.). Those causes can be discovered and tested, but evolution is not a goal-directed or purposeful process.

Why the others are wrong:
- Animals, plants, and microbes do not have separate unrelated ancestries — all life shares common ancestry (universal common ancestor), with lineages diverging over time.
- Scientists do still study evolution — it is a well-supported scientific theory, but researchers continue to investigate its mechanisms, timing, and details.
- DNA is powerful evidence for evolution, but not the only evidence: fossils, comparative anatomy, embryology, biogeography, observed speciation, and many other lines of evidence also support evolutionary theory.