एक ही भौगोलिक क्षेत्र में सह-अस्तित्व में रहने वाली और फिर भी प्रजनन पृथक्करण (reproductive isolation) बनाए रखने वाली प्रजातियों को कहा जाता है:

Given below are two statements, one labeled as Assertion (A) and the other as Reason (R): Assertion (A): Darwin's finches demonstrate adaptive radiation because they evolved from a common ancestor into multiple species with distinct beak morphologies. Reason (R): Adaptive radiation involves ecological diversification of a species to occupy different available niches within the same geographical area. In light of the above statements, choose the correct option:

The age of the earliest cellular life on Earth is scientifically estimated to be approximately: