About This Chapter
How It Works:
- Identify the lessons in the Holt McDougal Organization of Life chapter with which you need help.
- Find the corresponding video lessons with this companion course chapter.
- Watch fun videos that cover the organization of life topics you need to learn or review.
- Complete the quizzes to test your understanding.
- If you need additional help, rewatch the videos until you've mastered the material or submit a question for one of our instructors.
Students will learn:
- Kinds of ecology
- Natural selection types
- What artificial selection is
- How living things are classified
- The characteristics of bacteria and fungi
- The life cycles of gymnosperms and angiosperms
- Characteristics of vertebrates and invertebrates
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1. The Environment, Levels of Ecology and Ecosystems
Do you know the difference between an environment and an ecosystem? In this lesson, you'll find out what makes an environment, and what makes an ecosystem. You'll also learn what ecology is and some of the ways that scientists study ecology using organisms, populations, communities, ecosystems and even the entire biosphere.
2. Natural Selection & Adaptation: Definition, Theory & Examples
How does natural selection help shape the amazing types of animals we witness around us? In this lesson, we'll explore adaptations and what they can tell us about a species' past evolution.
3. 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.
4. Artificial Selection in Evolution
Humans have been selectively breeding for desirable traits in plants and animals for a long time. This artificial selection allows for a lot of control in the breeding process but can also lead to unintended mutations within a population of organisms.
5. Taxonomy: Classification and Naming of Living Things
The name you give to a living thing may be completely different than the name someone else uses. In science, we use a common naming system for all living things to avoid confusion. This lesson will explore the basics of our classification system.
6. What is Bacteria? - Definition, Characteristics & Examples
This lesson will introduce the Bacteria, a large and diverse group of microorganisms. We will examine several key characteristics, as well as a few commonly known examples of bacterial species.
7. What are Fungi? - Types and Characteristics
In this lesson, we will examine the group of organisms known as the fungi. This group includes the familiar organisms mushrooms, yeasts and molds. We will look at several major characteristics of fungi, as well as a few disease-causing fungi.
8. A Gymnosperm Life Cycle: Reproduction of Plants with 'Naked Seeds'
Some plants, such as pine trees, are able to reproduce with unprotected seeds. We will look at the major structures involved in this form of alternation of generations in gymnosperms.
9. An Angiosperm Life Cycle: Flowering Plant Reproduction
When you think of how plants reproduce, you probably think of flowers. We will look at how flowering plants use specialized reproductive structures to complete an alternation of generations life cycle.
10. Vertebrates: Origin, Characteristics & Diversity
Vertebrates are diverse and widespread across Earth, but this was not always the case. In this lesson you'll learn about the origins and evolution of these animals, as well as explore their vast diversity.
11. Invertebrates: Definition & Examples
From bees to lobsters and octopi to cockroaches, invertebrates are everywhere. This lesson introduces them as a major group within biology and discusses their relationship with the human race.
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Other chapters within the Holt McDougal Environmental Science: Online Textbook Help course
- Holt McDougal Environmental Science Chapter 1: Science and the Environment
- Holt McDougal Environmental Science Chapter 2: Tools of Environmental Science
- Holt McDougal Environmental Science Chapter 3: The Dynamic Earth
- Holt McDougal Environmental Science Chapter 5: How Ecosystems Work
- Holt McDougal Environmental Science Chapter 6: Biomes
- Holt McDougal Environmental Science Chapter 7: Aquatic Ecosystems
- Holt McDougal Environmental Science Chapter 8: Understanding Populations
- Holt McDougal Environmental Science Chapter 9: The Human Population
- Holt McDougal Environmental Science Chapter 10: Biodiversity
- Holt McDougal Environmental Science Chapter 11: Water
- Holt McDougal Environmental Science Chapter 12: Air
- Holt McDougal Environmental Science Chapter 13: Atmosphere and Climate Change
- Holt McDougal Environmental Science Chapter 14: Land
- Holt McDougal Environmental Science Chapter 15: Food and Agriculture
- Holt McDougal Environmental Science Chapter 16: Mining and Mineral Resources
- Holt McDougal Environmental Science Chapter 17: Nonrenewable Energy
- Holt McDougal Environmental Science Chapter 18: Renewable Energy
- Holt McDougal Environmental Science Chapter 19: Waste
- Holt McDougal Environmental Science Chapter 20: The Environment and Human Health
- Holt McDougal Environmental Science Chapter 21: Economics, Policy and the Future