Question

how did life begin? this idea of an ancestral species producing an array of different subspecies is the foundation for what is now called the theory of common descent. life as we know it may have originated from a single ancestral species that through continuous descent with modification and natural selection over the course of millions of years has lead to not only different species but different classes, genera, and kingdoms. this may explain the variety of species we witness on earth today. what is the theory of common descent? (check all that apply) an explanation of how the diversity of organisms emerged on earth an indisputable model that will not change a single ancestor can, through millions of years of natural selection, modifications, and speciation, evolve into many different species.

Explanation:

The theory of common descent posits that life originated from a single - ancestral species which, over millions of years through natural selection, modifications, and speciation, evolved into a wide variety of species. It is an explanation for the diversity of organisms on Earth. Scientific theories are not indisputable and can change with new evidence.

Answer:

An explanation of how the diversity of organisms emerged on earth
A single ancestor can, through millions of years of natural selection, modifications, and speciation, evolve into many different species.