The process by which organisms change over time.

The process by which organisms change over time.

• A. Theory
• B. Evolution
• C. Descent with modification
• D. Fossil

Answer: (B)

Evolution is the process by which organisms change over time. It describes how allele frequencies in a population shift across generations, leading to changes in traits and, over long periods, the emergence of new species. This process is driven by mechanisms such as natural selection, genetic drift, mutations, and gene flow, which together shape the diversity of life we see. Fossils are evidence of past life and historical change, not the process itself. A theory is a broad, well-supported explanation for a set of phenomena, not the specific process of change. Descent with modification captures the idea that descendants arise from ancestors with changes, but the standard term that names the actual process of change over generations is evolution, including its underlying mechanisms.

Evolution is the process by which organisms change over time. It describes how allele frequencies in a population shift across generations, leading to changes in traits and, over long periods, the emergence of new species. This process is driven by mechanisms such as natural selection, genetic drift, mutations, and gene flow, which together shape the diversity of life we see.

Fossils are evidence of past life and historical change, not the process itself. A theory is a broad, well-supported explanation for a set of phenomena, not the specific process of change. Descent with modification captures the idea that descendants arise from ancestors with changes, but the standard term that names the actual process of change over generations is evolution, including its underlying mechanisms.