The most inclusive level of organization is exemplified by which of the following?

A. Heart
B. Carbon atom
C. DNA
D. Zebra
E. Red blood cell


Answer: D

Biology & Microbiology

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Which type of muscle typically surrounds hollow tubes and organs like the stomach?

A. smooth muscle B. skeletal muscle C. cardiac muscle D. voluntary muscle E. striated muscle

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Which action of the heart makes the first of the "lup-dup" sounds?

a. closing of the atrioventricular valves b. closing of the pulmonary valve c. closing of the aortic valve d. the contraction of the left ventricle e. the contraction of the right ventricle

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The earliest humans primarily used tools to ____

a. assist in locomotion b. provide protection c. facilitate the processing of food d. ward off predators e. construct shelters

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The structural framework in a cell is the

a. extracellular matrix. b. endoplasmic reticulum (ER). c. cytoskeleton. d. plasma membrane. e. endomembrane system

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