Question

At what point are any two populations that descend from common ancestor considered to be separate species?
(correct answer + 2, wrong answer - 0.50)

• A. When they are unable to interbreed and produce viable, fertile offspring
• B. When they look significantly different from each other
• C. When they can easily interbreed and produce offspring
• D. When their habitats are markedly different and separated from each other geographically

Answer 1

The correct option is A When they are unable to interbreed and produce viable, fertile offspring

Species is defined as the largest group of organisms that have the ability to interbreed and produce viable, fertile offsprings. Hence, two populations are regarded as separate species when they can no longer do so, this could be because of morphological differences or geographical isolation leading to evolution.