: This is the process by which descendants inherit traits from ancestors with slight variations, leading to genetic differences over time.
: All living organisms, from simple bacteria to complex mammals, share a single common ancestor (often referred to as LUCA —the Last Universal Common Ancestor). 2. Historical Perspectives on Evolutionary Theory evolution notes pdf download
Biological evolution is defined as a change in the of a population over time. While individual organisms can undergo physical changes, they do not evolve; only populations evolve as the frequency of inherited traits shifts across successive generations. : This is the process by which descendants
The history of evolutionary thought has transitioned from fixed-species beliefs to dynamic scientific models. Chapter 7 Evolution - S3waas from simple bacteria to complex mammals