Sharks and dolphins are not closely related and evolved their streamlined shapes separately from one another. This is an example of convergent evolution, in which two species that are not closely related evolve similar characteristics. Divergent evolution is the opposite.

Prokaryotes are simple, single-celled organisms which lack membrane bound nuclei. They developed before any of the other listed answer choices, as all of the other listed answer choices are multi-celled organisms that developed from prokaryotes.

Evolution is a process of orderly and gradual change or development. The theory that all living species have developed as a result of changes in their genetic material over time. Evolution is a change in the proportions of different genotypes in a population from one generation to the next. The characteristic of an organism that helps it survive and reproduce in a particular environment is adaptation. Variability is the range of alterations present in a genome, such as the number of diverse alleles of a specific gene. The differences in reproductive output among individuals of a population, normally as a result of genetic differences is differential reporduction. Gene flow is the movement of alleles from one population to another owing to the migration of individual organisms. 

Coevolution occurs when one species evolves at the same time as another related species. Often one of these species is a prey-animal that adapts or develops traits that increase survival and reproductive rates. The predator that hunts the prey is required to adapt, increasing favorable traits that allow them, once again, to be able to hunt the prey. Coevolution is a type of evolution, but is not a cause of evolution.

Speciation is a general term referring to evolutionary processes leading to the creation of a new species. This occurs when a parent species is divided into at least two groups that are isolated from each other. These isolated groups adapt and mutate separately until they are no longer compatible for breeding.

Evolution caused by geographic isolation takes place when a species is separated into multiple groups due to a physical barrier of some kind (like a rock fall blocking a previously open canyon).

Evolution due to reproductive isolation occurs when members of two species that were previously able to produce viable offspring cannot due to changes in physical characteristics or behaviors. These species can procreate, but their offspring are not viable (able to reproduce).

The correct answer is coevolution. It is defined as the continual evolution that interacting species have in response to each other.

The correct response is: genetic drift is completely random. It is a natural process that occurs at random and has profound impacts on species. Thus, genetic drift was not created by humans - it's a natural process. Genetic drift occurs in life forms, from the prokaryotes to the eukaryotes. And genetic drift occurs in all living organisms: plants, animals, bacteria, and fungi.

Because the Galapagos Islands cover a small area and have many ecological niches available, the evolution of Darwin's finches is best explained as adaptive radiation. Adaptive radiation refers to growing specialization between different types of the same species until they finally become different species, as with the small vs the large-beaked finches on the Galapagos, which eat different seeds.

Together in the 1960's, MacArthur and Wilson coined the term "Island Biogeography" within the field of Insular Biogeography. This is a theory that attempts to predict the number of species existing on an island, whether a literal island, or simply a habitat isolated from like habitats by an "ocean" of unlike habitats.