Heart excitation originates in the
a. atrioventricular node.
b. intercalated disk.
c. sinoatrial node.
d. pericardium.
e. endocardium.
C
Biology & Microbiology
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The area where open water fish roam is known as ____
a. the pelagic province b. the intertidal zone c. the neritic zone d. hydrothermal vents e. the benthic province.
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In a neuron at rest, the membrane is most permeable to
A. sodium. B. chloride. C. calcium. D. potassium. E. magnesium.
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In the Galapagos Islands, what led Darwin to suspect that species were not ‘fixed’ throughout time?
What will be an ideal response?
Biology & Microbiology
Seedless vascular plants require
a. wind to distribute their pollen b. water to reproduce sexually c. soil to reproduce sexually d. birds to distribute their pollen e. insects to distribute their pollen
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