3rd Grade Animal Worksheets: Explore the Wonders of the Animal Kingdom - Free Printable

To solve the problem, we need to fill in the blanks with the appropriate words from the provided list. Let's go through each sentence step by step:

Sentence 1:

The bodies of reptiles are covered in ________. Their young hatch from ________. Their body temperature changes with that of the environment, which means they are _________.

- Reptiles are covered in scales.
- Their young hatch from eggs.
- Their body temperature changes with the environment, so they are cold-blooded.

So, the completed sentence is:
The bodies of reptiles are covered in *scales*. Their young hatch from *eggs*. Their body temperature changes with that of the environment, which means they are *cold-blooded*.

Sentence 2:

Birds have a constant body temperature. This means that they are ________. Birds have ________ to breathe air. Their body is covered in _________.

- Birds have a constant body temperature, so they are warm-blooded.
- Birds have lungs to breathe air.
- Their body is covered in feathers.

So, the completed sentence is:
Birds have a constant body temperature. This means that they are *warm-blooded*. Birds have *lungs* to breathe air. Their body is covered in *feathers*.

Sentence 3:

All mammals have hair or ________. Almost every mammal gives live birth. Examples of mammals include cats, monkeys and _________.

- Mammals have hair or fur.
- Examples of mammals include humans.

So, the completed sentence is:
All mammals have hair or *fur*. Almost every mammal gives live birth. Examples of mammals include cats, monkeys and *humans*.

Sentence 4:

Fish breathe through their ________. Examples of fish are salmon, tuna, and _________.

- Fish breathe through their gills.
- Examples of fish include goldfish.

So, the completed sentence is:
Fish breathe through their *gills*. Examples of fish are salmon, tuna, and *goldfish*.

Sentence 5:

Amphibians have adapted to survive in many different types of habitats. However, they often begin their lives in the ________. Examples of amphibians are salamanders, frogs and _________.

- Amphibians often begin their lives in water.
- Examples of amphibians include newts.

So, the completed sentence is:
Amphibians have adapted to survive in many different types of habitats. However, they often begin their lives in the *water*. Examples of amphibians are salamanders, frogs and *newts*.

Final Answer:

1. The bodies of reptiles are covered in scales. Their young hatch from eggs. Their body temperature changes with that of the environment, which means they are cold-blooded.
2. Birds have a constant body temperature. This means that they are warm-blooded. Birds have lungs to breathe air. Their body is covered in feathers.
3. All mammals have hair or fur. Almost every mammal gives live birth. Examples of mammals include cats, monkeys and humans.
4. Fish breathe through their gills. Examples of fish are salmon, tuna, and goldfish.
5. Amphibians have adapted to survive in many different types of habitats. However, they often begin their lives in the water. Examples of amphibians are salamanders, frogs and newts.

Final Answer:
\boxed{
\begin{array}{l}
1. \text{scales, eggs, cold-blooded} \\
2. \text{warm-blooded, lungs, feathers} \\
3. \text{fur, humans} \\
4. \text{gills, goldfish} \\
5. \text{water, newts}
\end{array}
}