The cross-section of Aristolochia (birthwort) stem is shown in the attached figure. Observe the specimen. How old is this specimen?  How did you determine it?

Human Physiology: From Cells to Systems (MindTap Course List)
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Chapter9: Cardiac Physiology
Section9.5: Nourishing The Heart Muscle
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The cross-section of Aristolochia (birthwort) stem is shown in the attached figure. Observe the specimen.

How old is this specimen?  How did you determine it? 

Aristolochia older
stem x. S.
LPO
HPO
Transcribed Image Text:Aristolochia older stem x. S. LPO HPO
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