Which of the following is NOT a necessary component of a "true" circulatory system?

A. blood or hemolymph
B. blood vessels
C. one or more hearts
D. capillaries
E. All of these choices are components of a true circulatory system.


D. capillaries

Biology & Microbiology

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The stapes is directly connected to the ____

a. cochlea b. oval window c. tympanic membrane d. round window e. auditory nerve

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________ are events that have a greater impact on the population as conditions become more crowded

Fill in the blank(s) with correct word

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The ____ contains the greatest volume of ocean water

a. oceanic province b. intertidal zone c. euphotic zone d. neritic province e. limnetic zone

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Which of the following is a scientific name?

A. species B. bacteria C. Bacillus subtilis D. bacilli E. Protista

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