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Problem Analysis:

The image is a worksheet about animals, specifically focusing on the differences between invertebrates and vertebrates. The task involves filling in missing information about these two groups of animals, including their characteristics, examples, and other details.

Solution Approach:

We will systematically fill in the blanks based on biological knowledge about invertebrates and vertebrates.

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#### 1. Invertebrates:
- Do not have a ________ (or ________).
- Invertebrates do not have a backbone (or spine).

- Examples:
- The list provided includes examples such as octopus, squid, insects, starfish, sea urchin, jellyfish, crab, lobster, clam, snail, breathing gills, legs, wings, sharks, rugs, frogs, salamanders, tadpoles, snakes, crocodiles, lizards, owls, parrots, doves, and penguins.
- From this list, we can identify which are invertebrates:
- Octopus, squid, insects, starfish, sea urchin, jellyfish, crab, lobster, clam, snail are all invertebrates.

- Characteristics:
- Cold-blooded or warm-blooded?
- Most invertebrates are cold-blooded.
- Lays eggs or gives birth?
- Invertebrates typically lay eggs.
- Can live under water?
- Many invertebrates can live under water (e.g., octopus, squid, starfish, jellyfish).
- Have legs and wings?
- Some invertebrates have legs (e.g., insects, crabs), but none have wings (wings are specific to certain vertebrates like birds).

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#### 2. Vertebrates:
- Have a ________ (or ________).
- Vertebrates have a backbone (or spine).

- Examples:
- The list provided includes examples such as fish, amphibians, reptiles, and birds.
- These are all vertebrates.

- Characteristics:
- Cold-blooded or warm-blooded?
- Fish and reptiles are generally cold-blooded, while amphibians can be both cold-blooded and warm-blooded, and birds are warm-blooded.
- Lays eggs or gives birth?
- Fish, amphibians, and reptiles typically lay eggs, while birds also lay eggs.
- Can live under water and on land?
- Fish can only live under water, amphibians can live both under water and on land, reptiles can only live on land, and birds can fly and live on land.
- Have scales and skin?
- Fish have scales, amphibians have moist skin, reptiles have scaly skin, and birds have feathers and skin.

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Filling in the Blanks:

#### Invertebrates:
- Do not have a backbone (or spine).
- Examples: Octopus, squid, insects, starfish, sea urchin, jellyfish, crab, lobster, clam, snail.
- Cold-blooded or warm-blooded? Cold-blooded.
- Lays eggs or gives birth? Lays eggs.
- Can live under water? Can live under water.
- Have legs and wings? Have legs (some) and no wings.

#### Vertebrates:
- Have a backbone (or spine).
- Examples: Fish, amphibians, reptiles, birds.
- Cold-blooded or warm-blooded?
- Fish: Cold-blooded.
- Amphibians: Both cold-blooded and warm-blooded.
- Reptiles: Cold-blooded.
- Birds: Warm-blooded.
- Lays eggs or gives birth?
- Fish: Lay eggs.
- Amphibians: Lay eggs.
- Reptiles: Lay eggs.
- Birds: Lay eggs.
- Can live under water and on land?
- Fish: Can only live under water.
- Amphibians: Can live both under water and on land.
- Reptiles: Can only live on land.
- Birds: Can only live on land (but can fly).
- Have scales and skin?
- Fish: Have scales.
- Amphibians: Have moist skin.
- Reptiles: Have scaly skin.
- Birds: Have feathers and skin.

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Final Answer:

\[
\boxed{
\text{Invertebrates: Do not have a backbone (or spine). Examples: Octopus, squid, insects, starfish, sea urchin, jellyfish, crab, lobster, clam, snail. Cold-blooded, lay eggs, can live under water, have legs (some) and no wings.}
}
\]
\[
\boxed{
\text{Vertebrates: Have a backbone (or spine). Examples: Fish, amphibians, reptiles, birds. Characteristics vary by group: cold-blooded/warm-blooded, lay eggs, live under water/on land, have scales/moist/scaly skin/feathers.}
}
\]