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Skeletal System › ViewInsects skeletons which are made of the nitrogenous carbohydrate chitin.
A. exoskeletons
B. endoskeletons
C. hydrostatic skeletons
Circulatory System - Pathway of Blood › View
Name the valve on the right side of the heart between the right atria and right ventricle.
A. aortic semilunar valve
B. pulmonary semilunar valve
C. mitral valve
D. tricuspid valve