Science Notebook - Student Edition

Section 28.2 Diversity of Today's Fishes (continued)

Analyze the effects of human activities on fishes.

Damming rivers in Pacific Northwest:

Polluting waterways:

Sequence the evolution of fishes by writing the letter of the following

features on the cladogram in the order in which they appeared.

a. jaws, bony skeleton, primitive lung

b. jaws, paired fins, bony plates covering body

c. jaws, placoid scales, cartilaginous skeleton

Fishes and Amphibians 293

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Evolution of

Fishes

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Ecology of Fishes

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Describe ways in which humans can use water resources with

less impact on aquatic ecosystems. Identify how an individual could support this effort.

CONNECT

Main Idea Details

Jawless fishes Bony fishes

Hagfishes Lampreys OstracodermsPlacodermsChondrichthyesRay-finnedfishes Lobe-finned

fishes

Tetrapods

Limbs used for

locomotion

on land

Jaws, bony

skeleton,

swim bladder

Jawless, paired fins,

bony head shields

Jawless, no paired fins,

cartilaginous skeleton