Read the following statements and choose the following option: 1. The essence of Darwinian theory about evolution is adaptive radiation. 2. Evolution by natural selection, in a true sense would have started when cellular forms of life with differences in metabolic capability originated on earth. 3. Branching descent and natural selection are the two key concepts of Darwinian Theory of Evolution 4. Theoretically popul

Step-by-step solution

The essence of Darwinian theory about evolution is natural selection. The rate of appearance of new forms is linked to the life cycle or the life span. Microbes that divide fast have the ability to multiply and become millions of individuals within hours. A colony of bacteria (say A) growing on a given medium has built-in variation in terms of ability to utilise a feed component. A change in the medium composition would bring out only that part of the population (say B) that can survive under the new conditions. In