Answer:
1: A. geographic isolation
2. C. They can apply to more than one animal.
Step-by-step explanation:
1: Separation of populations of the species by any physical barriers such as rivers, mountains, oceans etc. is called as geographical isolation. Geographical isolation is often followed by accumulation of variations in the separated species with time. Gradually, the separated populations evolve as two individual species as they cannot interbreed to produce fertile progeny.
2. Common names of organisms are given by local people and do not follow any scientific basis of nomenclature. One name can be given to more than one animal or plant leading to confusion. Lack of standard rules for nomenclature, possible repetition of common names make them useless for biologists.