4. Identify the source of blood flow in the section of the heart labeled 1.

F. the body

G. the aorta

H. the lungs

J. both lungs and body

DIRECTIONS: Complete the following analogy.

A. toads

B. newts

C. caecilians

D. salamanders

INTERPRETING GRAPHICS: The figure below shows an artist's rendering of Ichthyostega. Use the figure to answer the question that follows.

6. Ichthyostega is an early amphibian. Which of the following characteristics is most likely to help it live on land?

F. fishlike tail

G. seven-toed feet

H. four strong limbs

J. lateral-line canals on the head

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