Vertebrates are animals with endoskeletons.

Vocabulary: vertebrates, endoskeleton

13.1 Review
1. because they have an endoskeleton that includes vertebrae, or a backbone
2. gills, a swim bladder, a lateral line, fins, streamlined body
3. Jawless: no jaw, tube-shaped body;
Cartilaginous: skeleton made of cartilage
Bony: skeleton made of bone, scales
4. Sample Answers: similar coloration, body shapes, and similarities in behavior
5. A fish tht retained the eggs inside its body would produce fewer eggs than one that laid its eggs in water. However, eggs protected inside the parent´s body would be less vulnerable to predators.
6. Sharks are very well adapted to their environment and have been able to meet their needs without changing.

Vertebrates

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