About This Chapter
Geologic Natural Evidence for Evolution - Chapter Summary
When learning about evolutionary biology, students will want to understand the geologic framework that supports the theory of evolution. This chapter provides information regarding the various methods used to date the earth, fossil records, and evolutionary relationships. These informative lessons, break key concepts down into short pieces, enabling you to grasp the information quickly. With the ability to learn using any device, you can study anywhere. When you've finished reviewing this chapter, you will be able to:
- Describe how scientists date the planet using geological layers and radioactive dating
- Tell why the age of the earth supports the theory of descent with modifications
- Identify how fossils can tell us about changes in the environment
- Examine different types of natural selection
- Understand evolutionary and phylogenic trees
- Recognize the process of convergent evolution
1. Using Geological Layers & Radioactive Dating to Determine the Earth's Age
If you want to know how old a person is, you ask them. If you want to get an idea about a tree's age, you count its rings. But what if you want to know the age of the Earth? In this lesson, we'll get an idea of how scientists date our planet.
2. Age of the Earth as Evidence for Evolution
In this lesson, we'll be looking at the age of the Earth. We'll learn what evidence scientists have for the accurate dating of the age of the Earth as well as how this provides evidence for evolution.
3. Using Fossil Evidence to Evaluate Changes in Environment & Life Conditions
How can something that died tens of millions of years ago help people in the present day understand the past? In the case of fossils, these long-dead specimens can be perfect clues for figuring out changes in environment and life conditions.
4. Fossil Evidence for Biological Diversity, Speciation, & Mass Extinction
One of the best sources of evidence we have for evolution is the fossil record. Fossils provide a wealth of information on how species change over time and for exciting events like mass extinctions and new species formation.
5. Natural Selection: Definition, Types & Examples
We'll take a look at the types of natural selection that can occur. From flying hamsters to moths, you'll start to grasp the different paths organisms can take as they respond to their changing environments over time.
6. Evolutionary Relationships: Definition & Diagram
Just like you can build a family tree to show the relationships of your ancestors and their descendants, scientists can build trees to show the evolutionary relationships of species. In this lesson, learn how to interpret these evolutionary trees.
7. Maximum Parsimony & Likelihood Methods in Phylogeny
How are living things related? That's the question behind phylogeny. In this lesson, we are going to explore the concept of phylogeny as well as scientists create phylogenetic trees of life and test their accuracy.
8. Convergent Evolution: Examples & Definition
Can you tell whether species are related by looking at them? Organisms look and act the way they do because of various evolutionary processes. Convergent evolution can provide both insight and issues when studying relationships and structural similarities.
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Other chapters within the Biology 301: Evolutionary Biology course
- The History of Life on Earth
- Genetic Evidence for Evolution
- Evolutionary Mechanisms: Alleles, Genes & Genetic Drift
- Evolutionary Mechanisms: Gene Flow, Natural Selection & Inbreeding
- Natural Selection & Adaptation in Populations
- Evidence for Adaptation
- Speciation & Macroevolution
- Evolution & Taxonomy
- Evolution of Humans