Animal Classification

How do scientists divide the animals into two main groups?

• Animals are grouped by whether or not they have backbones

• Animals are grouped by their colors

• Animals are grouped by the size they are

• Animals are grouped by their characteristics

How do nematocysts help some animals get food?

• By injecting venom into their prey
• By using their long tongues to capture their prey
• By using their strong claws to catch their prey
• By using their sharp teeth to tear apart their prey

How do cephalopods move?

• Swimming with fins
• Jet propulsion
• Walking on land
• Flying in the air

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Echinoderms eat ​ (a)   ​ (b)   or​ they are (c)   ​

• mollusks
• other echinoderms
• filter feeders
• small fish
• algae
• plankton

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Match the meaning to the word

• Divided down the middle

• Free-living worms

• Independent of other organisms

• Parasites

• Live on or in other living organisms

• Bilateral symmetry

Two characteristics of arthropods

• Gills and fins
• Segmented bodies and endoskeletons
• Feathers and scales
• Jointed appendages and exoskeletons

Why is a spider not an insect?

• A spider is not an insect because it has six legs instead of three.
• A spider is not an insect because it does not have wings.
• A spider is not an insect because it does not undergo metamorphosis like insects do.
• A spider has eight legs and only two body parts.

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How are fish and amphibians alike?

• They both have fur and give birth to live young.
• They both have wings and can fly.
• They both have scales and lay eggs.
• They are both cold-blooded and have gills for respiration.

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What does amphibian mean?

• Double life

• A type of reptile
• A group of warm-blooded animals
• A species of fish