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Which of the following is not true of the location of the heart?

An impulse to contract the heart would be carried by the conduction system in which sequence?

If this valve were damaged, it could allow blood to leak back into the right atrium.

  Match the letters on the on the diagram to what plant structures occur there.

Choose the best word to complete the sentence: The government provides _____________ for public education.

Which of the following statements about flowers is false? 

Steroids are able to pass easily through a target cell’s plasma membrane because they are:

Which of the following is not true of white blood cells?

Which of the following Rh factor combinations could cause agglutination of an infant’s red blood cells?

Phospolipids are the principle molecules found in: