The answer is speciation by geographic isolation. When the population of a species gets separated due to reasons such as continental drift, mountains, canyons, etc. then each separated group of population may survive and adapt to their respective environment leading to speciation. These barriers do not allow the evolving populations to interbreed initially and over time when they evolve into different species they become completely reproductively isolated.
Answer:
The answer is natural selection
Explanation:
The modern theory of evolution was developed by Charles Darwin, an amateur English naturalist, in the 19th century
Answer: Unlike unicellular archaea and bacteria, eukaryotes may also be multi cellular and include organisms consisting of many cell types forming different kinds of tissue.
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