Animal Classification for 3rd Grade
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Questions and Answers

What is the primary reason scientists group, or classify, animals?

  • To rank them according to their size
  • To understand the habitat of each animal
  • To make them easier to study (correct)
  • To determine the diet of each animal

    • What is common to all vertebrates?

  • Having a backbone and a brain
  • Having feathers, fur, or hair
  • Having an endoskeleton and scales
  • Having a backbone, an endoskeleton, and some or all of the main systems (correct)

    • What is NOT a characteristic of vertebrates?

  • Having a shell (correct)
  • Having an endoskeleton
  • Having a way to get waste out of the body
  • Having a backbone

    • How many main groups do vertebrates get divided into?

    <p>Five</p> Signup and view all the answers

    What is the smallest vertebrate mentioned in the passage?

    <p>Frog</p> Signup and view all the answers

    What is a characteristic that mammals have in common?

    <p>They have hair or fur.</p> Signup and view all the answers

    Why are reptiles considered cold-blooded?

    <p>Because their body temperature changes when the temperature around them changes.</p> Signup and view all the answers

    What do amphibians use to breathe oxygen?

    <p>Skin and lungs.</p> Signup and view all the answers

    What is a characteristic that birds and mammals share?

    <p>They are warm-blooded.</p> Signup and view all the answers

    Why do scientists create smaller groups within the five main groups of vertebrates?

    <p>To make it easier to study them.</p> Signup and view all the answers

    Study Notes

    Grouping by Similarities

    • Scientists group animals into categories to study them more easily, just like students are divided into different classrooms.
    • The first division is between vertebrates (with a backbone) and invertebrates (without a backbone).

    Characteristics of All Vertebrates

    • Vertebrates have a backbone or spinal column.
    • Vertebrates have an endoskeleton, which includes bones that give shape to the body.
    • Vertebrates have various systems, including muscles, heart and blood, skin, waste removal, immunity, and a nervous system that controls the body.

    Five Kinds of Vertebrates

    • Vertebrates can be divided into five main groups: mammals, birds, fish, amphibians, and reptiles.
    • Each group is determined by shared characteristics.
    • There are at least 59,000 kinds of vertebrates on Earth.

    Characteristics of Each Vertebrate Group

    Mammals

    • Warm-blooded, meaning they regulate their own body temperature.
    • Have hair or fur.
    • Have lungs for breathing air.
    • Feed milk to their babies.
    • Most give birth to live young, rather than laying eggs.

    Birds

    • Have feathers.
    • Have two wings, although not all can fly.
    • Are warm-blooded.
    • Lay eggs.

    Fish

    • Have fins or scales.
    • Live in water.
    • Have gills for breathing oxygen.

    Amphibians

    • Have smooth, moist skin.
    • Lay eggs in water.
    • Most breathe through lungs and skin.

    Reptiles

    • Have scales.
    • Are cold-blooded, meaning their body temperature changes with the environment.
    • Breathe air.
    • Most lay hard-shelled eggs on land.

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    Description

    Learn how scientists group animals into categories, including vertebrates and invertebrates, to make them easier to study and understand.

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