Humans evolved from simpler organisms.

Question

BlackTom AI · Accepted Answer

Common descent explains why humans are the product of a long evolutionary lineage that began with simpler life forms such as single-celled organisms. Relevant knowledge points: natural selection and mutation generate heritable variation; populations change over generations (evolution); common ancestry means species share earlier forms; evidence comes from fossils, comparative anatomy, embryology, and molecular genetics.

Step-by-step reasoning:
1. Define terms: "Evolved" means change in populations over generations by evolutionary mechanisms (selection, drift, mutation, gene flow). "Simpler organisms" refers to earlier, less complex life-forms (e.g., single-celled prokaryotes) and intermediate multicellular ancestors.
2. Mechanism: Mutations introduce genetic variation; selection and drift alter allele frequencies across generations, producing new adaptations and, over long times, new species with greater complexity in some lineages.
3. Evidence chain: The fossil record shows transitional hominins (Ardipithecus, Australopithecus, Homo habilis, Homo erectus) that bridge the gap between apelike ancestors and modern Homo sapiens. Comparative anatomy reveals homologous structures (limb bones, skull features) indicating shared ancestry. Embryology demonstrates conserved developmental stages. Molecular genetics gives direct evidence: DNA sequence comparisons show close similarity to other primates (e.g., ~98–99% similarity with chimpanzees) and deeper homology to all life via conserved genes (e.g., ribosomal RNA).
4. Time scale: Life originated ~3.5–4 billion years ago; multicellular organisms and vertebrates evolved later, with the hominin lineage diverging from the chimpanzee lineage ~6–7 million years ago—ample time for the gradual evolution from simpler ancestors.

Why True is correct: All lines of modern biological evidence consistently support that humans evolved from earlier, simpler organisms through descent with modification. Why False is incorrect: Rejecting evolution ignores the convergent, multi-disciplinary evidence and common descent framework; it often misstates that humans descended from modern monkeys rather than sharing a common ancestor.

Final confirmation: The correct answer is True.

Humans evolved from simpler organisms.判断题

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