Main Idea Worksheets - Free Printable

Problem Overview:

The task is to identify the main idea of the paragraph about dolphins and provide two supporting ideas for it. The paragraph discusses dolphins as mammals, their characteristics, and how they differ from other animals like fish, reptiles, and birds.

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Solution:

#### Step 1: Identify the Main Idea
The main idea is the central point or the most important concept being conveyed in the paragraph. To find it, focus on what the paragraph is primarily about.

- The paragraph discusses dolphins as mammals.
- It explains that dolphins are different from fish, reptiles, and birds because they are mammals.
- It highlights key mammalian traits, such as breathing oxygen, giving birth to live young, and feeding them milk.

From this, the main idea can be summarized as:
> Dolphins are mammals with unique characteristics that set them apart from other ocean-dwelling creatures like fish, reptiles, and birds.

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#### Step 2: Write Two Supporting Ideas
Supporting ideas are details that help explain or prove the main idea. These should directly relate to the main idea and provide evidence or examples.

1. Supporting Idea 1: Dolphins breathe oxygen, even though they live in water. This trait is typical of mammals and distinguishes them from fish, which breathe through gills.
- Explanation: This supports the main idea by highlighting a key mammalian characteristic (breathing oxygen) that dolphins share.

2. Supporting Idea 2: Dolphin mothers give birth to live young and feed them milk, unlike reptiles and birds, which lay eggs.
- Explanation: This supports the main idea by emphasizing another defining mammalian trait—live birth and lactation—which dolphins exhibit.

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Final Answer:

1. Main Idea: Dolphins are mammals with unique characteristics that set them apart from other ocean-dwelling creatures like fish, reptiles, and birds.
2. Supporting Idea 1: Dolphins breathe oxygen, even though they live in water.
3. Supporting Idea 2: Dolphin mothers give birth to live young and feed them milk, unlike reptiles and birds, which lay eggs.

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Boxed Final Answer:

\boxed{
\text{Main Idea: Dolphins are mammals with unique characteristics that set them apart from other ocean-dwelling creatures like fish, reptiles, and birds.}
}
\boxed{
\text{Supporting Idea 1: Dolphins breathe oxygen, even though they live in water.}
}
\boxed{
\text{Supporting Idea 2: Dolphin mothers give birth to live young and feed them milk, unlike reptiles and birds, which lay eggs.}
}