The evolution of aquatic vertebrates that could live on land likely involved an intermediate species that
A) could fly.
B) had a single lung.
C) had a tracheal system of branching internal tubes.
D) had both gills and lungs.
Correct Answer:
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Q2: Which animal requires the largest and most
Q3: When you exhale, you
A) exchange CO2 for
Q4: The reason animals need a continuous supply
Q5: Animals that effectively use their body surface
Q6: The tracheal system of an insect is
Q8: Which of the following organisms has a
Q9: One advantage of gas exchange in water
Q10: During gas exchange, body cells
A) take up
Q11: Gills are unsuitable for animals living on
Q12: Which of the following animals would most
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