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Ch 7: Biological Science

About This Chapter

Watch video lessons, and learn about the different aspects of biological science. Follow-up your lessons with quick quizzes to make sure you understand the concepts presented in the videos.

Biological Science - Chapter Summary and Learning Objectives

Did you take biology in high school? Biology is just another name for biological science, which is the topic of this chapter. As you may know, biological science is the study of living things. In our lessons, we will introduce you to different environments in which you can find living things, such as oceans and forests. You'll learn about ecosystems and biological diversity. Lessons will also touch on extinction and discuss why animals become endangered. Other things that will be covered in this chapter include:

  • Species richness
  • Threatened vs. endangered animals
  • Human factors in extinction
  • Invasive species
  • Conservation biology
  • Ecology restoration

VideoObjective
Species Richness: Definition & Determining Factors Discover species richness and the factors that go into determining species richness.
Ecosystems of Oceans and Freshwater: Biological Diversity and Water Explore how biological diversity of marine and freshwater environments contributes to the ecosystems.
Biological Diversity and the Forest: Ecosystems of the Rainforests and Temperate Forests Examine how biological diversity of rainforests and temperate forests contribute to the ecosystems.
What Is Biodiversity? - Definition and Relation to Ecosystem Stability Use desert ecosystems - both hot and cold - to learn about biodiversity.
What Is Extinction? - Defining Background and Mass Extinction Study extinction and distinguish between background extinction and mass extinction.
Differences Between Endangered Species and Threatened Species Take a look at threatened and endangered species.
Pollution and Habitat Destruction: The Human Factors Contributing To Endangerment & Extinction Find out more about how humans have caused habitat destruction and fragmentation.
What Is an Invasive Species? - Definition, List & Effects Discuss how humans have caused the loss of species diversity in ecosystems.
Over-Exploitation: How Humans Affect Ecosystems By Decreasing Species Populations Learn how humans have over-exploited numerous species and how this changes an entire ecosystem.
What Is Conservation Biology? - Definition, Principles & Quiz Analyze conservation biology and compare in-situ and ex-situ conservation.
Ecology Restoration: Foundations, Projects and Goals Learn about restoration ecology and its goals.
The Endangered Species Act & The World Conservation Strategy: Goals & PurposesDescribe the goals and purpose of the US endangered species act and the world conservation strategy, provide examples of success and failures as well as benefits and shortcomings.

12 Lessons in Chapter 7: Biological Science
Species Richness: Definition & Determining Factors

1. Species Richness: Definition & Determining Factors

In this lesson, you'll learn what species richness is and what factors can influence the index of species richness. You'll also discover why it is an important index to measure in terms of conservation.

Ecosystems of Oceans and Freshwater: Biological Diversity and Water

2. Ecosystems of Oceans and Freshwater: Biological Diversity and Water

In this lesson, you'll learn about the biodiversity of ecosystems based on water. You will discover that marine, freshwater and a mixture of salt and freshwater create very different ecosystems, which in turn influence the amount of biodiversity that is found in these habitats.

Biological Diversity and the Forest: Ecosystems of the Rainforests and Temperate Forests

3. Biological Diversity and the Forest: Ecosystems of the Rainforests and Temperate Forests

In this lesson, you'll learn about three main types of forests found on earth: coniferous, deciduous and tropical rainforests. You'll also discover how the ecosystems where these trees are located affect the biodiversity within them.

Desert Ecosystems: How Biodiversity Impacts Hot and Cold Deserts

4. Desert Ecosystems: How Biodiversity Impacts Hot and Cold Deserts

In this lesson, you'll learn about the biodiversity that makes up a desert ecosystem. You will discover what makes a desert a desert and study the different plant and animal life that inhabit both hot and cold deserts.

What Is Extinction? - Defining Background and Mass Extinction

5. What Is Extinction? - Defining Background and Mass Extinction

In this lesson you'll discover what the term 'extinction' means as well as learn the two different types of extinction: mass extinction and background extinction. You will also discover how humans contribute to extinction events.

Differences Between Endangered Species and Threatened Species

6. Differences Between Endangered Species and Threatened Species

In this lesson you'll learn about two terms that describe species with very low population numbers: threatened and endangered. You'll discover why species numbers decline and how we can keep the species that are threatened or endangered from going extinct.

Pollution and Habitat Destruction: The Human Factors Contributing To Endangerment & Extinction

7. Pollution and Habitat Destruction: The Human Factors Contributing To Endangerment & Extinction

In this lesson you will learn about two ways humans contribute to species extinction. We break up habitats by building roads and clearing land, and we pollute both land and water. You will also learn about the specific terms used to describe the processes, habitat fragmentation and anthropogenic pollution.

What Is an Invasive Species? - Definition, List & Effects

8. What Is an Invasive Species? - Definition, List & Effects

This lesson focuses on a group of organisms called invasive species. You'll learn what makes a species invasive and see some examples of invasive species. You'll also discover why invasive species are considered a problem and explore the impacts they have on the environment, the economy and on humans.

Over-Exploitation: How Humans Affect Ecosystems By Decreasing Species Populations

9. Over-Exploitation: How Humans Affect Ecosystems By Decreasing Species Populations

In this lesson, you'll learn how humans overexploit or overharvest species. You will discover the primary way in which humans are responsible for overfishing. You will also learn about how this negatively impacts ecosystems.

What Is Conservation Biology? - Definition & Principles

10. What Is Conservation Biology? - Definition & Principles

Conservation biology aims to reduce the human impact on the environment by looking for the causes and possible solutions to these problems. In this lesson, you'll learn about conservation biology and the different types of conservation.

Ecology Restoration: Foundations, Projects and Goals

11. Ecology Restoration: Foundations, Projects and Goals

In this lesson you will learn how humans have damaged various ecosystems on the planet and how a branch of ecology, restoration ecology, aims to restore these ecosystems. You will discover the main goal of restoration ecology as well as some of the ways habitats are restored.

The Endangered Species Act & The World Conservation Strategy: Goals & Purposes

12. The Endangered Species Act & The World Conservation Strategy: Goals & Purposes

In this lesson, you will learn about the Endangered Species Act, an environmental law that protects endangered species. You will also discover how the ESA works and how species are protected under it. Finally, you will learn how a World Conservation Strategy can help endangered and threatened species worldwide.

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