According to Darwinian evolution, the evolutionary process from amoebas to humans occurred _______.

• A. due to the inheritance of acquired characteristics
• B. through a gradual accumulation of small, heritable changes over long periods of time
• C. as a result of sudden, large-scale mutations in a single generation
• D. because individuals consciously adapted to their environment

Answer: (B)

Verified step by step guidance

1. Step 1: Understand the concept of Darwinian evolution. Darwinian evolution is based on the idea of natural selection, where organisms with advantageous traits are more likely to survive and reproduce, passing those traits to the next generation.
2. Step 2: Eliminate incorrect options by analyzing their alignment with Darwinian principles. For example, 'inheritance of acquired characteristics' aligns with Lamarckian evolution, not Darwinian evolution.
3. Step 3: Consider the role of gradual changes in Darwinian evolution. Darwin proposed that evolution occurs through the accumulation of small, heritable changes over long periods of time, rather than sudden, large-scale mutations.
4. Step 4: Evaluate the idea of conscious adaptation. Darwinian evolution does not involve individuals consciously adapting to their environment; instead, it is a passive process driven by genetic variation and environmental pressures.
5. Step 5: Select the correct answer based on the principles of Darwinian evolution: 'through a gradual accumulation of small, heritable changes over long periods of time.'