Which sequence represents the correct hierarchy of biological organization?
a. cell-organ-tissue-system-organism.
b. cell-tissue-organ-system-organism.
c. tissue-cell-system-organism-organ.
d. organ-tissue-cell-organism-system.
e. system-cell-organ-organism-tissue.
B
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A general characteristic of connective tissue is that it
A) has no blood supply. B) covers the outside of organs. C) lines organs. D) consists of cells with much extracellular material.
If a substance can cross a membrane, the membrane is _____to that substance
Fill in the blank(s) with correct word
The _____ sends out an electrical impulse that begins and regulates the heartbeat.?
A) ?AV node B) ?SA node C) ?Purkinje fibers D) ?AV bundle
According to Boyle's law, the pressure of a gas ________ if the volume of its container increases.
A. remains the same B. decreases C. increases