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What usually happens to the pith over time?

Which of the following is the male gametangia?

To what superclass does the jawed fishes & all other vertebrates belong?

What is the leaf arrangement shown in the picture below? whorledleaf.png

Match the information to the correct canal system. 

What structure protects or covers the eye when amphibians and reptiles are underwater?

To what superclass does the jawless fishes belong?

Which of the following is TRUE concerning flatworms?

Which type of symmetry is defined as division into similar halves divided only along the midline or sagittal plane?

What are the structures responsible for excretion in flatworms?