HISTOLOGY
BLOOD VESSELS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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True or False:Unicellular organisms have an open circulatory system.
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True
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False
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Either A or B
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None of the above
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Explanation:
Detailed explanation-1: -Unicellular organisms are made up of only one cell that carries out all of the functions needed by the organism, while multicellular organisms use many different cells to function. Unicellular organisms include bacteria, protists, and yeast.
Detailed explanation-2: -A circulatory system is not needed in organisms with no specialized respiratory organs, such as unicellular organisms, because oxygen and carbon dioxide diffuse directly between their body tissues and the external environment.
Detailed explanation-3: -A single cell makes up a unicellular organism, which executes all of the biological activities necessary for existence.
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