Learn on PengiAmplify Science (California) Grade 3Chapter 1: Why are wolves different from each other even though they are all the same species?

Sesson 1: Species and Life Cycles

Key Idea.

Section 1

Organisms Display Observable Traits

Key Idea

Every living thing, such as a plant, an animal, or a person, is an organism. All organisms have specific features that can be observed. These features are called "observable characteristics," and they help describe what the organism looks like or does.

These observable characteristics are known as traits. A trait could be the color of a dog's fur, the shape of a leaf, or the number of legs on an insect. Scientists study traits to understand and compare different living things.

Section 2

Scientists Sort Organisms by Traits

Key Idea

All living things have observable features called traits. These can include things like fur color, leaf shape, or the number of legs. Scientists carefully observe these traits to learn about different organisms.

When scientists compare organisms, they look for similarities and differences in their traits. This helps them classify the organisms, which means sorting them into groups. An animal with feathers and wings would be grouped with other animals that also have feathers and wings.

Section 3

Scientists Group Organisms into Species

Key Idea

Scientists see that some organisms share many of the same traits, like how all robins have feathers and beaks. When a group of organisms shares many important traits, scientists call it a species.

Members of a species are very closely related, like members of a family. This is why they look so much alike. For example, all gray wolves belong to the same species. A wolf is much more related to another wolf than it is to a butterfly.

Lesson overview

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Section 1

Organisms Display Observable Traits

Key Idea

Every living thing, such as a plant, an animal, or a person, is an organism. All organisms have specific features that can be observed. These features are called "observable characteristics," and they help describe what the organism looks like or does.

These observable characteristics are known as traits. A trait could be the color of a dog's fur, the shape of a leaf, or the number of legs on an insect. Scientists study traits to understand and compare different living things.

Section 2

Scientists Sort Organisms by Traits

Key Idea

All living things have observable features called traits. These can include things like fur color, leaf shape, or the number of legs. Scientists carefully observe these traits to learn about different organisms.

When scientists compare organisms, they look for similarities and differences in their traits. This helps them classify the organisms, which means sorting them into groups. An animal with feathers and wings would be grouped with other animals that also have feathers and wings.

Section 3

Scientists Group Organisms into Species

Key Idea

Scientists see that some organisms share many of the same traits, like how all robins have feathers and beaks. When a group of organisms shares many important traits, scientists call it a species.

Members of a species are very closely related, like members of a family. This is why they look so much alike. For example, all gray wolves belong to the same species. A wolf is much more related to another wolf than it is to a butterfly.