Ch 32: Introduction to Vertebrates [Section 1]

Ch 32: Introduction to Vertebrates

[Section 1]

Vertebrates in the Sea and on Land

Quick Review

• Mass extinctions have resulted in losses of up to 96% of all species of animals

• Vertebrate- animal with a backbone

• Continental Drift- movement of Earth's landmasses over geologic time

• Carnivore- animals that eats other animals

• Herbivore- animal that eats plants and other primary producers

Quick Review

• Bilateral symmetry is a body  plan in which the right and left halves look the same.

• Cephalization  is an anterior concentration of sensory structures and nerves.

• A coelom is a fluid-filled space between the body wall and the gut.

• The function of genes is to carry the instructions for making a protein.

• Phylogenic relationships provide very strong evidence for evolution, because they reflect relationships indicated by the fossil record.

Fill in the Blanks

Individual segments, called

, make up the backbone.

Fill in the Blanks

Unlike most of the fishes you are familiar with, the earliest fishes, called

, had neither jaws nor paired fins.

Fill in the Blanks

The acanthodians had strong jaws with jagged, bony edges that served as teeth, enabling them to hold onto prey.

Fill in the Blanks

Jaws are thought to have evolved from gill arch supports made of

, a lightweight, strong, flexible tissue.

Multiple Choice

Bony fishes live in a wide variety of habitats, and there is great variation in their appearance.

• True

• False