Evolution is a theory that explains how organisms change over time. It is the process by which species of organisms develop and diversify.

The theory of evolution is based on two main ideas: descent with modification and natural selection. In this article, we will discuss the principal theory of how evolution works Quizlet.

Descent with Modification

The theory of descent with modification proposes that all living organisms are related to each other through a common ancestor. This means that all life on earth shares a common history and has evolved from a single organism. Over time, species have diverged from their common ancestor as they adapted to different environments.

Natural Selection

Natural selection is the driving force behind evolution. It is the process by which certain traits become more or less common in a population over time.

When an organism has a trait that gives it an advantage in its environment, it is more likely to survive and reproduce. This trait will then be passed on to its offspring, making it more common in the population.

Quizlet’s Principal Theory

Quizlet’s principal theory of how evolution works is based on these two main ideas: descent with modification and natural selection. Quizlet proposes that all living organisms have descended from a single ancestor and have evolved over time through natural selection.

According to Quizlet, natural selection occurs when individuals in a population vary in their traits, and those traits affect their ability to survive and reproduce. Individuals with advantageous traits are more likely to survive and pass those traits on to their offspring, while those with disadvantageous traits are less likely to do so.

Examples of Natural Selection

One example of natural selection is the peppered moth during the Industrial Revolution in England. Prior to industrialization, most peppered moths had light-colored wings that blended well with the lichen-covered tree trunks where they lived. However, as pollution from factories darkened the tree trunks, darker-colored moths became more common because they were better camouflaged and had a higher chance of survival.

Another example is the evolution of antibiotic-resistant bacteria. When antibiotics are introduced into an environment, bacteria with the mutation that gives them resistance to the antibiotic will survive and reproduce, passing on the resistant trait to their offspring. Over time, this can lead to the emergence of a population of antibiotic-resistant bacteria.

Conclusion

In conclusion, Quizlet’s principal theory of how evolution works is based on descent with modification and natural selection. Natural selection is driven by advantageous traits that give organisms a survival advantage in their environment.

This process has led to the diversity of life we see today. Understanding how evolution works is crucial for understanding how species adapt and change over time.